diff --git a/src/main/capabilities/desktop.ts b/src/main/capabilities/desktop.ts
index da27c4b..e6a7248 100644
--- a/src/main/capabilities/desktop.ts
+++ b/src/main/capabilities/desktop.ts
@@ -122,7 +122,8 @@ const runApp: CapabilityHandler = async (_ctx, node, args) => {
   if (!executable) throw new RuntimeError("validation_error", "应用路径为空", { nodeId: node.id, componentId: node.componentId });
   const params = text(args, ["params", "arguments"]);
   const cwd = text(args, ["cwd"]);
-  const result = await powershell(`$p = Start-Process -FilePath ${psString(executable)} -ArgumentList ${psString(params)} ${cwd ? `-WorkingDirectory ${psString(cwd)}` : ""} -PassThru; $p.Id`);
+  const argPart = params ? ` -ArgumentList ${psString(params)}` : "";
+  const result = await powershell(`$p = Start-Process -FilePath ${psString(executable)}${argPart} ${cwd ? `-WorkingDirectory ${psString(cwd)}` : ""} -PassThru; $p.Id`);
   return Number(result) || result;
 };
 
@@ -161,3 +162,4 @@ register("Clipboard_SetText", clipboardSet);
 register("Dialog_Notice", notice);
 register("Dialog_MsgBox", notice);
 register("System_ExecuteCommand", executeCommand);
+