diff --git a/src/alias.txt b/src/alias.txt
index 5450dcc..d541fae 100644
--- a/src/alias.txt
+++ b/src/alias.txt
@@ -191,6 +191,18 @@ alias nn='micro'
 alias nnd='micro compose.yml'
 alias dush='du -sh'
 
+function wdt() {
+  echo "输入测速文件大小(MB) [默认: 2048]: "
+  read -t 30 -p "> " testfile_size
+  if [ $? -ne 0 ] || [ -z "$testfile_size" ]; then
+    testfile_size=2048
+    echo -e "\n使用默认值: ${testfile_size}MB"
+  fi
+  time dd if=/dev/zero of=./testfile bs=1M count=${testfile_size} oflag=direct
+  time dd if=./testfile of=/dev/null bs=1M
+  rm ./testfile
+}
+
 function din() {
   docker exec -it "$1" /bin/sh
 }