diff --git a/bin/gen_cert.sh b/bin/gen_cert.sh
index 3afae05..4603719 100644
--- a/bin/gen_cert.sh
+++ b/bin/gen_cert.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-script_dir="$(dirname "$(realpath "$0")")"   # 当前脚本所在目录的绝对路径
-key_dir=$(readlink -f "$script_dir/../key")  # key目录绝对路径
+SCRIPT_DIR="$(dirname "$(realpath "$0")")"   # 当前脚本所在目录的绝对路径
+KEY_DIR=$(readlink -f "$SCRIPT_DIR/../key")  # key目录绝对路径
 
-openssl req -x509 -nodes -newkey ec:<(openssl ecparam -name prime256v1) -keyout "$key_dir/server.key" -out "$key_dir/server.crt" -subj "/CN=bing.com" -days 36500 
\ No newline at end of file
+openssl req -x509 -nodes -newkey ec:<(openssl ecparam -name prime256v1) -keyout "$KEY_DIR/server.key" -out "$KEY_DIR/server.crt" -subj "/CN=bing.com" -days 36500 
\ No newline at end of file