diff --git a/openless-all/app/src-tauri/src/asr/local/download.rs b/openless-all/app/src-tauri/src/asr/local/download.rs
index 5a6fc91d..9ab23d01 100644
--- a/openless-all/app/src-tauri/src/asr/local/download.rs
+++ b/openless-all/app/src-tauri/src/asr/local/download.rs
@@ -461,6 +461,59 @@ const PARALLEL: usize = 8;
 const PER_CHUNK_ATTEMPTS: u32 = 4;
 const PARALLEL_FILES: usize = 3;
 
+/// `.partial` 文件的真实已下字节（不是 sparse 逻辑大小）。
+/// 有 `.partial.idx` → chunked 模式，按 idx 里 chunk 数还原；
+/// 没有 → append/single-stream 模式，partial 是 dense，meta.len() 即真实字节。
+pub fn partial_actual_size(partial: &Path) -> u64 {
+    let total_size = match std::fs::metadata(partial) {
+        Ok(m) => m.len(),
+        Err(e) => {
+            eprintln!(
+                "[local-asr] partial_actual_size: stat partial failed ({}): {}",
+                partial.display(),
+                e
+            );
+            return 0;
+        }
+    };
+    if total_size == 0 {
+        return 0;
+    }
+    let idx_path = partial.with_extension("partial.idx");
+    if !idx_path.exists() {
+        return total_size;
+    }
+    let content = match std::fs::read_to_string(&idx_path) {
+        Ok(s) => s,
+        Err(e) => {
+            // idx 不可读 → 不知道哪些 chunk 已落盘，sparse 全长不可信，只能回 0。
+            // 但日志要留，否则进度条无故归零没法排查。
+            eprintln!(
+                "[local-asr] partial_actual_size: read idx failed ({}): {}",
+                idx_path.display(),
+                e
+            );
+            return 0;
+        }
+    };
+    let mut seen: HashSet<usize> = HashSet::new();
+    let mut total: u64 = 0;
+    for line in content.lines() {
+        let Ok(idx) = line.trim().parse::<usize>() else { continue };
+        if !seen.insert(idx) {
+            continue;
+        }
+        let start = (idx as u64).saturating_mul(CHUNK_SIZE);
+        if start >= total_size {
+            continue;
+        }
+        // 最后一块可能不到 CHUNK_SIZE
+        let end = (start + CHUNK_SIZE).min(total_size);
+        total += end - start;
+    }
+    total
+}
+
 async fn download_one(
     client: &reqwest::Client,
     url: &str,
@@ -508,6 +561,12 @@ async fn download_one(
         f.set_len(total_size)
             .with_context(|| format!("set_len partial failed: {}", partial.display()))?;
     }
+    // 模式标记：sparse partial 必须配对 .partial.idx（哪怕空），
+    // 否则 walk_files 看到 partial 有但 idx 无，会把 sparse 全长当成已下完。
+    if !idx_path.exists() {
+        std::fs::write(&idx_path, b"")
+            .with_context(|| format!("touch partial.idx failed: {}", idx_path.display()))?;
+    }
 
     // 4. 总计已下字节（用于初始化进度）
     let initial_done: u64 = chunks
diff --git a/openless-all/app/src-tauri/src/asr/local/models.rs b/openless-all/app/src-tauri/src/asr/local/models.rs
index a22df5e7..9ae76f16 100644
--- a/openless-all/app/src-tauri/src/asr/local/models.rs
+++ b/openless-all/app/src-tauri/src/asr/local/models.rs
@@ -82,15 +82,22 @@ fn walk_files<F: FnMut(u64)>(dir: &std::path::Path, on_size: &mut F) {
     };
     for entry in entries.flatten() {
         let path = entry.path();
-        let name = entry.file_name();
-        // 哨兵文件本身体积忽略不计，但路径过滤更直白：保留所有非空文件。
+        let name_os = entry.file_name();
+        let name = name_os.to_string_lossy();
         if name == READY_SENTINEL {
             continue;
         }
+        // .partial.idx 是 chunk 完成索引，不算下载字节
+        if name.ends_with(".partial.idx") {
+            continue;
+        }
         match entry.file_type() {
             Ok(ft) if ft.is_dir() => walk_files(&path, on_size),
             Ok(ft) if ft.is_file() => {
-                if let Ok(meta) = entry.metadata() {
+                // .partial 在 chunked 模式下是 sparse 全长，meta.len() 不是真实字节
+                if name.ends_with(".partial") {
+                    on_size(super::download::partial_actual_size(&path));
+                } else if let Ok(meta) = entry.metadata() {
                     on_size(meta.len());
                 }
             }
diff --git a/openless-all/app/src/pages/LocalAsr.tsx b/openless-all/app/src/pages/LocalAsr.tsx
index 9b166a40..35cada25 100644
--- a/openless-all/app/src/pages/LocalAsr.tsx
+++ b/openless-all/app/src/pages/LocalAsr.tsx
@@ -143,7 +143,16 @@ export function LocalAsr() {
       const { listen } = await import('@tauri-apps/api/event');
       const off = await listen<LocalAsrDownloadProgress>('local-asr-download-progress', e => {
         const payload = e.payload;
-        setProgress(prev => ({ ...prev, [payload.modelId]: payload }));
+        if (payload.phase === 'cancelled') {
+          // 取消时清条目，bar 是否还显示交给 hasPartial 判断
+          setProgress(prev => {
+            const next = { ...prev };
+            delete next[payload.modelId];
+            return next;
+          });
+        } else {
+          setProgress(prev => ({ ...prev, [payload.modelId]: payload }));
+        }
         if (
           payload.phase === 'finished' ||
           payload.phase === 'cancelled' ||
@@ -185,18 +194,56 @@ export function LocalAsr() {
 
   const handleDownload = async (modelId: string) => {
     setBusyModelId(modelId);
+    // 重下载时，第一个后端事件到达前先用本地已知值占位，避免进度条从 0% 跳到真实位置。
+    // 优先级：上一次 progress（取消后已删，通常没有）→ models 里的 downloadedBytes（cancel 时乐观写入）
+    const model = models.find(m => m.id === modelId);
+    const initialDownloaded =
+      progress[modelId]?.bytesDownloaded ?? model?.downloadedBytes ?? 0;
+    setProgress(prev => ({
+      ...prev,
+      [modelId]: {
+        modelId,
+        file: '',
+        fileIndex: 0,
+        fileCount: remoteSizes[modelId]?.fileCount ?? 0,
+        bytesDownloaded: initialDownloaded,
+        bytesTotal: remoteSizes[modelId]?.totalBytes ?? 0,
+        phase: 'started',
+        error: null,
+      },
+    }));
     try {
       await downloadLocalAsrModel(modelId, settings?.mirror);
     } catch (e) {
       setError(e instanceof Error ? e.message : String(e));
+      setProgress(prev => {
+        const cur = prev[modelId];
+        if (cur?.phase === 'started') {
+          return { ...prev, [modelId]: { ...cur, phase: 'failed', error: e instanceof Error ? e.message : String(e) } };
+        }
+        return prev;
+      });
     } finally {
       setBusyModelId(null);
     }
   };
 
   const handleCancel = async (modelId: string) => {
+    // Progress 事件里的 bytesDownloaded 是后端 in_flight + already_done，是真实字节
+    const lastBytes = progress[modelId]?.bytesDownloaded ?? 0;
     try {
       await cancelLocalAsrDownload(modelId);
+      setProgress(prev => {
+        const next = { ...prev };
+        delete next[modelId];
+        return next;
+      });
+      // 乐观更新：让 hasPartial 立刻翻 true，不等 listener 200ms 后的 refresh
+      if (lastBytes > 0) {
+        setModels(prev =>
+          prev.map(m => (m.id === modelId ? { ...m, downloadedBytes: lastBytes } : m)),
+        );
+      }
     } catch (e) {
       setError(e instanceof Error ? e.message : String(e));
     }
@@ -458,8 +505,7 @@ function ModelRow({
   // 进度条要保留：有 partial 残留（downloadedBytes>0 但未完整）就一直显示，
   // 让用户看到上次下到哪里了，再点下载会从那里续。
   const hasPartial = !model.isDownloaded && model.downloadedBytes > 0;
-  const showProgress =
-    isDownloading || progress?.phase === 'failed' || progress?.phase === 'cancelled' || hasPartial;
+  const showProgress = isDownloading || progress?.phase === 'failed' || hasPartial;
 
   const sizeLabel = remoteSize?.loading
     ? t('localAsr.sizeLoading')
@@ -497,8 +543,6 @@ function ModelRow({
                     background:
                       progress?.phase === 'failed'
                         ? '#d04545'
-                        : progress?.phase === 'cancelled'
-                        ? 'var(--ol-ink-4)'
                         : 'var(--ol-accent-blue, #2c5cff)',
                     transition: 'width 120ms linear',
                   }}
@@ -507,8 +551,6 @@ function ModelRow({
               <div style={{ fontSize: 11, color: 'var(--ol-ink-4)', marginTop: 6 }}>
                 {progress?.phase === 'failed'
                   ? `${t('localAsr.failed')}: ${progress.error ?? ''}`
-                  : progress?.phase === 'cancelled'
-                  ? t('localAsr.cancelled')
                   : `${formatBytes(downloadedBytes)} / ${formatBytes(totalBytes)}` +
                     (progress?.file ? ` · ${progress.file}` : '')}
               </div>