diff --git a/debian/changelog b/debian/changelog
index 55118f5c..4b3e1c4a 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,4 +1,4 @@
-spark-store (5.2.1.6-test) UNRELEASED; urgency=medium
+spark-store (5.2.1.7-test) UNRELEASED; urgency=medium
 
   * Initial release. (Closes: #nnnn)  <nnnn is the bug number of your ITP>
 
diff --git a/electron/main/backend/install-manager.ts b/electron/main/backend/install-manager.ts
index aed615e7..bff79869 100644
--- a/electron/main/backend/install-manager.ts
+++ b/electron/main/backend/install-manager.ts
@@ -629,9 +629,22 @@ ipcMain.on("cancel-install", (event, id) => {
   const isRunning = task.phase === "downloading" || task.phase === "installing";
 
   if (isRunning) {
-    // 运行中的任务：终止进程，由对应的阶段处理器在 finally 中清理计数器与队列
-    task.download_process?.kill();
-    task.install_process?.kill();
+    // 运行中的任务：先发 SIGTERM 优雅终止；若 5s 内未退出，降级 SIGKILL 强制杀除，
+    // 避免子进程忽略 SIGTERM 变成僵尸进程（改进项：进程取消需 SIGKILL 降级处理）。
+    const forceKill = (proc: ChildProcess | null, label: string) => {
+      if (!proc || proc.killed) return;
+      proc.kill("SIGTERM");
+      const pid = proc.pid;
+      setTimeout(() => {
+        if (proc && !proc.killed) {
+          logger.warn(`任务 ${id} 的 ${label} 进程(${pid}) 未响应 SIGTERM，发送 SIGKILL`);
+          proc.kill("SIGKILL");
+        }
+      }, 5000);
+    };
+    forceKill(task.download_process, "下载");
+    forceKill(task.install_process, "安装");
+    // 由对应的阶段处理器在 finally 中清理计数器与队列
   } else {
     // 排队中的任务（未开始执行）：直接清理并调度
     tasks.delete(id);