diff --git a/local-markdown-gfm-design-checklist.png b/local-markdown-gfm-design-checklist.png
new file mode 100644
index 00000000..10a67727
Binary files /dev/null and b/local-markdown-gfm-design-checklist.png differ
diff --git a/local-markdown-gfm-design-page.png b/local-markdown-gfm-design-page.png
new file mode 100644
index 00000000..2e95c291
Binary files /dev/null and b/local-markdown-gfm-design-page.png differ
diff --git a/rust/Cargo.lock b/rust/Cargo.lock
index 5ffd306e..cfccded4 100644
--- a/rust/Cargo.lock
+++ b/rust/Cargo.lock
@@ -670,6 +670,15 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "fsevent-sys"
+version = "4.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76ee7a02da4d231650c7cea31349b889be2f45ddb3ef3032d2ec8185f6313fd2"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "futures"
 version = "0.3.32"
@@ -1140,6 +1149,26 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "inotify"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd5b3eaf1a28b758ac0faa5a4254e8ab2705605496f1b1f3fbbc3988ad73d199"
+dependencies = [
+ "bitflags",
+ "inotify-sys",
+ "libc",
+]
+
+[[package]]
+name = "inotify-sys"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e05c02b5e89bff3b946cedeca278abc628fe811e604f027c45a8aa3cf793d0eb"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "interpolator"
 version = "0.5.0"
@@ -1225,6 +1254,26 @@ version = "0.2.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4933f3f57a8e9d9da04db23fb153356ecaf00cbd14aee46279c33dc80925c37"
 
+[[package]]
+name = "kqueue"
+version = "1.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eac30106d7dce88daf4a3fcb4879ea939476d5074a9b7ddd0fb97fa4bed5596a"
+dependencies = [
+ "kqueue-sys",
+ "libc",
+]
+
+[[package]]
+name = "kqueue-sys"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a7b65860415f949f23fa882e669f2dbd4a0f0eeb1acdd56790b30494afd7da2f"
+dependencies = [
+ "bitflags",
+ "libc",
+]
+
 [[package]]
 name = "lazy_static"
 version = "1.5.0"
@@ -1438,6 +1487,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "50b7e5b27aa02a74bac8c3f23f448f8d87ff11f92d3aac1a6ed369ee08cc56c1"
 dependencies = [
  "libc",
+ "log",
  "wasi",
  "windows-sys 0.61.2",
 ]
@@ -1476,6 +1526,7 @@ dependencies = [
  "futures-util",
  "leptos",
  "mnote-editor-core",
+ "notify",
  "reqwest",
  "serde",
  "serde_json",
@@ -1494,6 +1545,33 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "60993920e071b0c9b66f14e2b32740a4e27ffc82854dcd72035887f336a09a28"
 
+[[package]]
+name = "notify"
+version = "8.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d3d07927151ff8575b7087f245456e549fea62edf0ec4e565a5ee50c8402bc3"
+dependencies = [
+ "bitflags",
+ "fsevent-sys",
+ "inotify",
+ "kqueue",
+ "libc",
+ "log",
+ "mio",
+ "notify-types",
+ "walkdir",
+ "windows-sys 0.60.2",
+]
+
+[[package]]
+name = "notify-types"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42b8cfee0e339a0337359f3c88165702ac6e600dc01c0cc9579a92d62b08477a"
+dependencies = [
+ "bitflags",
+]
+
 [[package]]
 name = "nu-ansi-term"
 version = "0.50.3"
diff --git a/rust/crates/mnote-web/Cargo.toml b/rust/crates/mnote-web/Cargo.toml
index 24ce3352..169d6fbd 100644
--- a/rust/crates/mnote-web/Cargo.toml
+++ b/rust/crates/mnote-web/Cargo.toml
@@ -23,4 +23,5 @@ tracing-subscriber = { version = "0.3", features = ["fmt"] }
 tower = "0.5"
 base64 = "0.22"
 comrak = { version = "0.52", default-features = false }
+notify = "8.2.0"
 time = { version = "0.3", features = ["formatting"] }
diff --git a/rust/crates/mnote-web/src/routes/local_folder_events.rs b/rust/crates/mnote-web/src/routes/local_folder_events.rs
new file mode 100644
index 00000000..74c6c753
--- /dev/null
+++ b/rust/crates/mnote-web/src/routes/local_folder_events.rs
@@ -0,0 +1,256 @@
+use crate::context::RequestContext;
+use crate::error::WebError;
+use crate::routes::local_folder_source::decode_local_id_segment;
+use axum::extract::{Extension, Query};
+use axum::http::{HeaderMap, HeaderName, HeaderValue};
+use axum::response::sse::{Event as SseEvent, KeepAlive, Sse};
+use futures_util::stream;
+use notify::event::ModifyKind;
+use notify::{Config, Event, EventKind, RecommendedWatcher, RecursiveMode, Watcher};
+use serde::Deserialize;
+use serde_json::{json, Value};
+use std::convert::Infallible;
+use std::path::{Path, PathBuf};
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
+use tokio::sync::mpsc;
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct LocalFolderEventsQuery {
+    pub root_uri: String,
+    pub document_id: Option<String>,
+}
+
+pub async fn local_folder_events(
+    Extension(context): Extension<RequestContext>,
+    Query(query): Query<LocalFolderEventsQuery>,
+) -> Result<
+    (
+        HeaderMap,
+        Sse<impl futures_util::Stream<Item = Result<SseEvent, Infallible>>>,
+    ),
+    WebError,
+> {
+    let root = parse_file_root_uri(&query.root_uri)?;
+    let canonical_root = root.canonicalize().map_err(|error| {
+        WebError::bad_request_code(
+            "local_folder_unavailable",
+            format!("无法访问本地文件夹: {error}"),
+        )
+        .with_context(&context)
+    })?;
+    let document_relative_path = query
+        .document_id
+        .as_deref()
+        .and_then(local_markdown_relative_path_from_document_id);
+
+    let (sender, receiver) = mpsc::unbounded_channel::<Value>();
+    let (watch_sender, mut watch_receiver) =
+        mpsc::unbounded_channel::<notify::Result<Event>>();
+    let mut watcher = RecommendedWatcher::new(
+        move |result| {
+            let _ = watch_sender.send(result);
+        },
+        Config::default(),
+    )
+    .map_err(|error| {
+        WebError::internal(format!("本地文件事件监听启动失败: {error}")).with_context(&context)
+    })?;
+    watcher
+        .watch(&canonical_root, RecursiveMode::Recursive)
+        .map_err(|error| {
+            WebError::internal(format!("本地文件夹监听失败: {error}")).with_context(&context)
+        })?;
+
+    let root_for_task = canonical_root.clone();
+    let root_uri = query.root_uri.clone();
+    tokio::spawn(async move {
+        let _watcher = watcher;
+        while let Some(result) = watch_receiver.recv().await {
+        let Ok(event) = result else {
+            continue;
+        };
+            if !should_emit_event_kind(&event.kind) {
+                continue;
+            }
+            for path in event.paths {
+                if !is_markdown_path(&path) {
+                    continue;
+                }
+                let Some(relative_path) = relative_path_string(&root_for_task, &path) else {
+                    continue;
+                };
+                if let Some(expected) = document_relative_path.as_deref() {
+                    if expected != relative_path {
+                        continue;
+                    }
+                }
+                let payload = json!({
+                    "sourceKind": "local_folder",
+                    "rootUri": root_uri,
+                    "relativePath": relative_path,
+                    "documentId": format!("local-md:{}", encode_local_id_segment(&relative_path)),
+                    "eventKind": format!("{:?}", event.kind),
+                    "revision": event_revision(&path),
+                });
+                if sender.send(payload).is_err() {
+                    return;
+                }
+            }
+        }
+    });
+
+    let initial = json!({
+        "sourceKind": "local_folder",
+        "rootUri": query.root_uri,
+        "documentId": query.document_id,
+        "revision": system_time_ms(SystemTime::now()),
+    });
+    let stream = stream::unfold((Some(initial), receiver), |(initial, mut receiver)| async move {
+        if let Some(payload) = initial {
+            return Some((Ok(stream_event("ready", &payload)), (None, receiver)));
+        }
+        receiver
+            .recv()
+            .await
+            .map(|payload| (Ok(stream_event("change", &payload)), (None, receiver)))
+    });
+
+    let mut headers = HeaderMap::new();
+    if let Ok(name) = HeaderName::from_lowercase(b"x-mnote-web-owner") {
+        headers.insert(name, HeaderValue::from_static("mnote-web"));
+    }
+    if let Ok(name) = HeaderName::from_lowercase(b"x-mnote-local-folder-events-owner") {
+        headers.insert(name, HeaderValue::from_static("rust-web"));
+    }
+
+    Ok((
+        headers,
+        Sse::new(stream).keep_alive(
+            KeepAlive::new()
+                .interval(Duration::from_secs(15))
+                .text("keepalive"),
+        ),
+    ))
+}
+
+fn parse_file_root_uri(root_uri: &str) -> Result<PathBuf, WebError> {
+    let trimmed = root_uri.trim();
+    let Some(path) = trimmed.strip_prefix("file://") else {
+        return Err(WebError::bad_request_code(
+            "local_folder_root_invalid",
+            "本地文件夹 rootUri 必须是 file:// URI",
+        ));
+    };
+    Ok(PathBuf::from(path))
+}
+
+fn local_markdown_relative_path_from_document_id(document_id: &str) -> Option<String> {
+    let trimmed = document_id.trim();
+    let encoded = trimmed.strip_prefix("local-md:")?;
+    decode_local_id_segment(encoded).ok()
+}
+
+fn relative_path_string(root: &Path, path: &Path) -> Option<String> {
+    path.strip_prefix(root)
+        .ok()
+        .map(|relative| relative.to_string_lossy().replace('\\', "/"))
+        .filter(|relative| !relative.is_empty())
+}
+
+fn is_markdown_path(path: &Path) -> bool {
+    path.extension()
+        .and_then(|extension| extension.to_str())
+        .map(|extension| {
+            extension.eq_ignore_ascii_case("md") || extension.eq_ignore_ascii_case("markdown")
+        })
+        .unwrap_or(false)
+}
+
+fn should_emit_event_kind(kind: &EventKind) -> bool {
+    match kind {
+        EventKind::Create(_) | EventKind::Remove(_) => true,
+        EventKind::Modify(modify_kind) => matches!(
+            modify_kind,
+            ModifyKind::Any | ModifyKind::Data(_) | ModifyKind::Name(_) | ModifyKind::Metadata(_)
+        ),
+        _ => false,
+    }
+}
+
+fn encode_local_id_segment(value: &str) -> String {
+    let mut encoded = String::with_capacity(value.len());
+    for byte in value.as_bytes() {
+        let character = *byte as char;
+        if character.is_ascii_alphanumeric() || matches!(character, '.' | '_' | '-') {
+            encoded.push(character);
+        } else {
+            encoded.push('~');
+            encoded.push_str(&format!("{byte:02X}"));
+        }
+    }
+    encoded
+}
+
+fn event_revision(path: &Path) -> u128 {
+    std::fs::metadata(path)
+        .ok()
+        .and_then(|metadata| metadata.modified().ok())
+        .map(system_time_ms)
+        .unwrap_or_else(|| system_time_ms(SystemTime::now()))
+}
+
+fn system_time_ms(time: SystemTime) -> u128 {
+    time.duration_since(UNIX_EPOCH)
+        .map(|duration| duration.as_millis())
+        .unwrap_or(0)
+}
+
+fn stream_event(event_name: &str, payload: &Value) -> SseEvent {
+    let id = payload
+        .get("revision")
+        .and_then(|value| {
+            value
+                .as_str()
+                .map(ToOwned::to_owned)
+                .or_else(|| value.as_u64().map(|number| number.to_string()))
+        })
+        .unwrap_or_else(|| "0".to_string());
+    SseEvent::default()
+        .event(event_name)
+        .id(id)
+        .json_data(payload)
+        .expect("SSE 事件必须可序列化")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn local_markdown_document_id_maps_to_relative_path() {
+        assert_eq!(
+            local_markdown_relative_path_from_document_id("local-md:docs~2FREADME.md")
+                .as_deref(),
+            Some("docs/README.md")
+        );
+    }
+
+    #[test]
+    fn markdown_path_filter_accepts_markdown_files_only() {
+        assert!(is_markdown_path(Path::new("README.md")));
+        assert!(is_markdown_path(Path::new("README.markdown")));
+        assert!(!is_markdown_path(Path::new("image.png")));
+    }
+
+    #[test]
+    fn event_kind_filter_ignores_access_events() {
+        assert!(should_emit_event_kind(&EventKind::Create(notify::event::CreateKind::File)));
+        assert!(should_emit_event_kind(&EventKind::Modify(ModifyKind::Data(
+            notify::event::DataChange::Content,
+        ))));
+        assert!(!should_emit_event_kind(&EventKind::Access(
+            notify::event::AccessKind::Read,
+        )));
+    }
+}
diff --git a/rust/crates/mnote-web/src/routes/local_folder_source.rs b/rust/crates/mnote-web/src/routes/local_folder_source.rs
index d8662f2d..efa51f8d 100644
--- a/rust/crates/mnote-web/src/routes/local_folder_source.rs
+++ b/rust/crates/mnote-web/src/routes/local_folder_source.rs
@@ -2088,7 +2088,7 @@ fn encode_local_id_segment(value: &str) -> String {
     encoded
 }
 
-fn decode_local_id_segment(value: &str) -> Result<String, WebError> {
+pub(crate) fn decode_local_id_segment(value: &str) -> Result<String, WebError> {
     let bytes = value.as_bytes();
     let mut decoded = Vec::with_capacity(bytes.len());
     let mut index = 0;
diff --git a/rust/crates/mnote-web/src/routes/mod.rs b/rust/crates/mnote-web/src/routes/mod.rs
index b6499112..067e91b5 100644
--- a/rust/crates/mnote-web/src/routes/mod.rs
+++ b/rust/crates/mnote-web/src/routes/mod.rs
@@ -8,6 +8,7 @@ mod health;
 mod hermes;
 mod kernel;
 mod local_folder_source;
+mod local_folder_events;
 mod local_markdown_parser;
 mod mindmap_shell;
 mod query_support;
@@ -97,6 +98,10 @@ pub fn build_router(state: AppState) -> Router {
             "/api/tree/local-folder-watch",
             get(tree::local_folder_watch),
         )
+        .route(
+            "/api/local-folder/events",
+            get(local_folder_events::local_folder_events),
+        )
         .route(
             "/api/tree/runtime/reduce",
             post(tree::reduce_tree_shell_runtime),
diff --git a/rust/crates/mnote-web/src/routes/web_shell.rs b/rust/crates/mnote-web/src/routes/web_shell.rs
index c2b17dcf..e48cb724 100644
--- a/rust/crates/mnote-web/src/routes/web_shell.rs
+++ b/rust/crates/mnote-web/src/routes/web_shell.rs
@@ -693,8 +693,7 @@ pub(crate) fn render_editor_island_adapter_script() -> &'static str {
   let lastSavedSerialized = '';
   let hasPendingLocalChanges = false;
   let suppressNextHostSyncChange = false;
-  let localExternalPollTimer = 0;
-  let localExternalPollInFlight = false;
+  let localExternalEvents = null;
   let lastExternalConflictDetectionKey = editorMeta.conflictDetectionKey || '';
   const normalizeBridgeValue = (value) => {
     if (value instanceof Map) {
@@ -858,10 +857,8 @@ pub(crate) fn render_editor_island_adapter_script() -> &'static str {
     setStatus('synced-external-change');
   };
 
-  const pollLocalMarkdownExternalChange = async () => {
+  const refreshFromExternalFileChange = async () => {
     if (bootstrap.sourceKind !== 'local_folder' || !bootstrap.rootUri || document.hidden) return;
-    if (localExternalPollInFlight) return;
-    localExternalPollInFlight = true;
     try {
       const response = await fetch(pageAggregateUrl().toString(), {
         cache: 'no-store',
@@ -883,11 +880,25 @@ pub(crate) fn render_editor_island_adapter_script() -> &'static str {
       dispatchReplaceContent(nextAggregate);
     } catch (error) {
       console.warn('mnote local folder 外部更新检测失败', error);
-    } finally {
-      localExternalPollInFlight = false;
     }
   };
 
+  const connectLocalMarkdownExternalEvents = () => {
+    if (bootstrap.sourceKind !== 'local_folder' || !bootstrap.rootUri || typeof window.EventSource !== 'function') {
+      return;
+    }
+    const url = new URL('/api/local-folder/events', window.location.origin);
+    url.searchParams.set('rootUri', bootstrap.rootUri);
+    url.searchParams.set('documentId', bootstrap.documentId);
+    localExternalEvents = new EventSource(url.toString());
+    localExternalEvents.addEventListener('change', () => {
+      void refreshFromExternalFileChange();
+    });
+    localExternalEvents.onerror = () => {
+      console.warn('mnote local folder 外部更新事件流中断，将等待浏览器自动重连');
+    };
+  };
+
   const start = async () => {
     setStatus('loading-assets');
     const manifestResponse = await fetch('/api/leptos-tiptap-runtime/manifest.json', { cache: 'no-store' });
@@ -909,12 +920,7 @@ pub(crate) fn render_editor_island_adapter_script() -> &'static str {
     if (typeof window.__mnoteApplyPageOptionsToShell === 'function') {
       window.__mnoteApplyPageOptionsToShell();
     }
-    if (bootstrap.sourceKind === 'local_folder' && bootstrap.rootUri) {
-      void pollLocalMarkdownExternalChange();
-      localExternalPollTimer = window.setInterval(() => {
-        void pollLocalMarkdownExternalChange();
-      }, 1200);
-    }
+    connectLocalMarkdownExternalEvents();
     setStatus('ready');
   };
 
@@ -1640,10 +1646,12 @@ mod tests {
         assert!(html.contains("asset.png"));
         assert!(html.contains("data-row-kind=\"markdown\""));
         assert!(html.contains("data-mnote-action=\"open-local-folder\""));
-        assert!(html.contains("pollLocalMarkdownExternalChange"));
-        assert!(html.contains("/api/page-aggregate/${encodeURIComponent(bootstrap.documentId)}"));
+        assert!(html.contains("refreshFromExternalFileChange"));
+        assert!(html.contains("/api/local-folder/events"));
+        assert!(html.contains("new EventSource(url.toString())"));
         assert!(html.contains("command: 'replaceContent'"));
         assert!(html.contains("external-change-conflict"));
+        assert!(!html.contains("setInterval(() => {\n        void pollLocalMarkdownExternalChange();\n      }, 1200);"));
     }
 
     #[tokio::test]