diff --git a/src/lib/server/separator.ts b/src/lib/server/separator.ts
new file mode 100644
index 0000000..e769ada
--- /dev/null
+++ b/src/lib/server/separator.ts
@@ -0,0 +1,66 @@
+import { error } from 'console'
+import { promises as fs } from 'fs'
+import path from 'path'
+
+const API_URL = process.env.AUDIO_SEPARATOR_API
+
+/**
+ * Separates a song into vocals and instrumental tracks using the Python API server.
+ * @param inputPath Absolute path to the input audio file.
+ * @param outputDir Directory where the output files (vocals.mp3, instrumental.mp3) will be saved.
+ */
+export async function separateSong(inputPath: string, outputDir: string) {
+    const vocalsPath = path.join(outputDir, 'vocals.opus')
+    const instrumentalPath = path.join(outputDir, 'instrumental.opus')
+    if (await fs.exists(vocalsPath) && await fs.exists(instrumentalPath)) return
+
+    // Read file and create FormData
+    const fileBuffer = await fs.readFile(inputPath)
+    const formData = new FormData()
+    formData.append('file', new Blob([fileBuffer]), 'input.mp3')
+
+    const res = await fetch(`${API_URL}/separate`, { method: 'POST', body: formData })
+    if (!res.ok) throw error(500, '无法连接到分离服务')
+    const { task_id } = await res.json()
+
+    // Poll for completion
+    while (true) {
+        await new Promise(r => setTimeout(r, 1000))
+        const statusRes = await fetch(`${API_URL}/status/${task_id}`)
+        const status = await statusRes.json()
+
+        if (status.status === 'completed') {
+            // Download results
+            const downloadStem = async (stem: string, dest: string) => {
+                const fileRes = await fetch(`${API_URL}/result/${task_id}/${stem}`)
+                if (!fileRes.ok) throw error(500, `无法下载 ${stem}`)
+                const buffer = await fileRes.arrayBuffer()
+                await fs.writeFile(dest, Buffer.from(buffer))
+            }
+
+            await downloadStem('vocals', vocalsPath)
+            await downloadStem('instrumental', instrumentalPath)
+            
+            // Clean up task on server
+            try {
+                await fetch(`${API_URL}/task/${task_id}`, { method: 'DELETE' })
+            } catch (e) {
+                console.warn(`无法清理任务 ${task_id}:`, e)
+            }
+            break
+        }
+        if (status.status === 'error') throw error(500, status.error || '分离失败')
+        if (status.status === 'not_found') throw error(500, '任务丢失')
+    }
+}
+
+export async function checkAudioSeparator() {
+    if (!API_URL) return console.warn('未设置音频分离服务地址，跳过连接性检查')
+    try {
+        const res = await fetch(API_URL)
+        if (res.ok) console.log(`音频分离服务连接成功 ${API_URL}`)
+        else console.warn(`音频分离服务返回状态 ${res.status} at ${API_URL}`)
+    } catch (e) {
+        console.error(`无法连接到音频分离服务 ${API_URL}:`, e)
+    }
+}
diff --git a/src/lib/server/songs.ts b/src/lib/server/songs.ts
index 20a8361..6096224 100644
--- a/src/lib/server/songs.ts
+++ b/src/lib/server/songs.ts
@@ -8,6 +8,8 @@ import type { ObjectId } from 'mongodb'
 import '../ext'
 import { promises as fs } from 'fs'
 import path from 'path'
+import { waitFor } from '../utils'
+import { separateSong } from './separator'
 
 const CACHE_DIR = path.resolve('static/audio')
 
@@ -171,26 +173,15 @@ export const prepareSong = async (songId: number) => {
 
         // 4. Source Separation
         const taskSeparation = addTask('AI 人声分离')
-        const vocalsPath = path.join(CACHE_DIR, `${songId}/vocals.mp3`)
-        
-        let retries = 0
-        // Wait up to 10 minutes (separation can be slow on CPU)
-        while (retries < 600) {
-            try {
-                await fs.access(vocalsPath)
-                taskSeparation.progress = 1
-                break
-            } catch {
-                // File doesn't exist yet
-                await new Promise(r => setTimeout(r, 1000))
-                retries++
-                // Update progress to show it's alive
-                if (retries % 5 === 0) taskSeparation.progress = Math.min(0.99, retries / 600)
-            }
-        }
+        const inputPath = path.join(CACHE_DIR, `${songId}/exhigh.mp3`)
+        const outputDir = path.join(CACHE_DIR, `${songId}`)
 
-        if (taskSeparation.progress < 1) {
-            addTask('警告: AI 人声分离超时，请检查后台脚本').progress = -1
+        try {
+            await separateSong(inputPath, outputDir)
+            taskSeparation.progress = 1
+        } catch (e: any) {
+            addTask(`错误: ${e.message}`).progress = -1
+            // Don't fail the whole process, just this step
         }
         
         state.status = 'done'
diff --git a/src/routes/song/[id]/+page.svelte b/src/routes/song/[id]/+page.svelte
index 5ccc875..dafeabb 100644
--- a/src/routes/song/[id]/+page.svelte
+++ b/src/routes/song/[id]/+page.svelte
@@ -32,7 +32,7 @@
           }))
           
           const totalProgress = state.items.reduce((acc: number, cur: any) => acc + Math.max(0, cur.progress), 0)
-          progressPercentage = Math.min(100, Math.round((totalProgress / 3) * 100))
+          progressPercentage = Math.min(100, Math.round((totalProgress / 4) * 100))
       }
 
       if (state.status === "done") {