diff --git a/src/main/java/pw/yumc/BukkitInjectedTools/YumTestCommand.java b/src/main/java/pw/yumc/BukkitInjectedTools/YumTestCommand.java
index a52a772..a1db4a6 100644
--- a/src/main/java/pw/yumc/BukkitInjectedTools/YumTestCommand.java
+++ b/src/main/java/pw/yumc/BukkitInjectedTools/YumTestCommand.java
@@ -4,6 +4,7 @@ import java.io.File;
 import java.io.IOException;
 import java.net.URL;
 import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
 
 import org.bukkit.Bukkit;
 import org.bukkit.OfflinePlayer;
@@ -15,6 +16,7 @@ import pw.yumc.YumCore.bukkit.P;
 import pw.yumc.YumCore.commands.CommandSub;
 import pw.yumc.YumCore.commands.annotation.Cmd;
 import pw.yumc.YumCore.commands.annotation.Help;
+import pw.yumc.YumCore.commands.annotation.Option;
 import pw.yumc.YumCore.commands.annotation.Sort;
 import pw.yumc.YumCore.commands.interfaces.Executor;
 import pw.yumc.YumCore.kit.PKit;
@@ -28,7 +30,6 @@ import pw.yumc.YumCore.kit.PKit;
 public class YumTestCommand implements Executor {
     private final String prefix = "§6[§bYum §a注入工具§6]§r ";
     private boolean downloading = false;
-    private String nfn = "null";
 
     public YumTestCommand() {
         Log.setPrefix(prefix);
@@ -113,12 +114,11 @@ public class YumTestCommand implements Executor {
     @Cmd
     @Help(value = "Yum 线程检测测试", possibleArguments = "文件大小[1 5 10 50]")
     @Sort(6)
-    public void thread(final CommandSender sender, String size) throws IOException {
+    public void thread(final CommandSender sender, @Option("def:5") final String size) throws IOException {
         if (downloading) {
             Log.sender(sender, "§c正在主线程下载文件,请勿重复测试...!");
             return;
         }
-        nfn = "null" + (size != null ? "-" + size : "");
         Log.sender(sender, "§c主线程中断测试开始!");
         PKit.scheduleTask(new Runnable() {
             @Override
@@ -126,11 +126,11 @@ public class YumTestCommand implements Executor {
                 downloading = true;
                 try {
                     final File nFile = new File(getDataFolder(), "null");
-                    Files.copy(new URL("https://coding.net/u/502647092/p/YumData/git/raw/master/dd/" + nfn).openStream(), nFile.toPath());
+                    Files.copy(new URL("https://coding.net/u/502647092/p/YumData/git/raw/master/dd/" + size).openStream(), nFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
                     nFile.delete();
                     Log.sender(sender, "§a主线程中断测试结束!");
                 } catch (final IOException e) {
-                    Log.sender(sender, "§a主线程中断测试失败 错误: " + e.getMessage());
+                    Log.sender(sender, "§a主线程中断测试失败 错误: " + e.getClass().getSimpleName() + " " + e.getMessage());
                 }
                 downloading = false;
             }