diff --git a/Cargo.lock b/Cargo.lock
index bdcb978..256c6d3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5,3 +5,12 @@ version = 4
 [[package]]
 name = "mini_web_server"
 version = "0.1.0"
+dependencies = [
+ "urlencoding",
+]
+
+[[package]]
+name = "urlencoding"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
diff --git a/Cargo.toml b/Cargo.toml
index 72b688f..099c852 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,3 +4,4 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+urlencoding = "2.1.3"
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 1470cf0..209b96e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,12 +1,45 @@
+use std::env;
 use std::fs;
 use std::path::Path;
 use std::io::{BufRead, BufReader, Write};
 use std::net::{TcpListener, TcpStream};
+use std::process::exit;
+use std::sync::OnceLock;
+use urlencoding::decode;
 use mini_web_server::ThreadPool;
 
 
+static GLOBAL_PATH: OnceLock<String> = OnceLock::new();
+
+
 fn main() {
-    let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
+    let args: Vec<String> = env::args().collect();
+    let addr = String::from("127.0.0.1:7878");
+
+    match args.len() {
+        1 => {
+            let path = String::from("./public");
+            GLOBAL_PATH.set(path).unwrap();
+        }
+        2 => {
+            let path = String::from(&args[1]);
+            GLOBAL_PATH.set(path).unwrap();
+            if Path::new(GLOBAL_PATH.get().unwrap()).try_exists().is_err() {
+                println!("path is invalid or not exist: {}", GLOBAL_PATH.get().unwrap());
+                exit(0);
+            }
+        }
+
+        _ => {
+            println!("usage: {} path/to/asset/", args[0]);
+            exit(0);
+        }
+    }
+    println!("set root path: {}", GLOBAL_PATH.get().unwrap());
+
+
+    let listener = TcpListener::bind(addr).unwrap();
+    println!("serverd on http://{}/", listener.local_addr().unwrap());
 
     let pool = ThreadPool::new(10);
 
@@ -66,7 +99,6 @@ fn handle_connection(mut stream: TcpStream) {
     }
 
     // 6. 安全地构建文件路径
-    let base_dir = "./public";
     let requested_path = path.trim_start_matches('/');
     if requested_path.contains("..") {
         stream.write(b"HTTP/1.1 403 Forbidden\r\n\r\n").unwrap();
@@ -92,9 +124,19 @@ fn handle_connection(mut stream: TcpStream) {
     // };
 
     // v4
-    let base_path = Path::new(base_dir);
+    let base_path = Path::new(GLOBAL_PATH.get().unwrap());
     let requested_path = path.trim_start_matches('/');  // 去掉开头的 '/'
 
+    let requested_path = match decode(requested_path) {
+        Ok(decoded) => decoded.into_owned(),
+
+        Err(_) => {
+            let _ = stream.write(b"HTTP/1.1 400 Bad Request\r\n\r\n");
+            let _ = stream.flush();
+            return;
+        }
+    };
+
     // 禁止路径遍历
     if requested_path.contains("..") {
         stream.write(b"HTTP/1.1 403 Forbidden\r\n\r\n").unwrap();