diff --git a/core/cli.py b/core/cli.py
index 4c4f025..26ab005 100644
--- a/core/cli.py
+++ b/core/cli.py
@@ -6,9 +6,9 @@ import io
 import click
 import subprocess
 from enum import StrEnum
-from contextlib import redirect_stdout
 
 import traffic
+import validator
 
 SCRIPT_DIR = 'scripts'
 DEBUG = True
@@ -58,8 +58,9 @@ def cli():
 
 # region hysteria2 menu options
 @cli.command('install-hysteria2')
-def install_hysteria2():
-    run_cmd(['bash', Command.INSTALL_HYSTERIA2])
+@click.option('--port','-p', required=True, help='New port for Hysteria2',type=int,validate=validator.validate_port)
+def install_hysteria2(port:int):
+    run_cmd(['bash', Command.INSTALL_HYSTERIA2, str(port)])
     
 
 @cli.command('uninstall-hysteria2')
@@ -76,7 +77,7 @@ def restart_hysteria2():
 
 
 @cli.command('change-hysteria2-port')
-@click.option('--port','-p', required=True, help='New port for Hysteria2',type=int)
+@click.option('--port','-p', required=True, help='New port for Hysteria2',type=int,validate=validator.validate_port)
 def change_hysteria2_port(port:int):
     run_cmd(['bash', Command.CHANGE_PORT_HYSTERIA2, str(port)])
 
diff --git a/core/validator.py b/core/validator.py
new file mode 100644
index 0000000..1ede3d4
--- /dev/null
+++ b/core/validator.py
@@ -0,0 +1,10 @@
+import os
+
+
+def validate_port(p:int)-> bool:
+    if p < 1 or p > 65535:
+        return False
+    # check if port is in use
+    if os.system(f'lsof -i:{p}') == 0:
+        return False
+    return True
\ No newline at end of file