diff --git a/build.rs b/build.rs
index 7430808cecd4fe1d31ba60c1d13726de1d8f5d9f..2f88dcd0355cb36731d33d570d7d955c1ee05186 100644
--- a/build.rs
+++ b/build.rs
@@ -1,6 +1,7 @@
 use regex::Regex;
 use std::{
     env,
+    ffi::OsStr,
     fs::File,
     io::{BufRead, BufReader, Write},
     path::PathBuf,
@@ -10,26 +11,35 @@ fn main() {
     let target_os = env::var("CARGO_CFG_LITEOS").is_ok();
     // Decode liteos configuration information and automatically generate configuration files.
     if target_os {
-        let pwd = env::var("PWD").unwrap();
-        let pwd = PathBuf::from_str(&pwd).unwrap();
+        let out_dir = env::var("OUT_DIR").unwrap();
+        let out_path = PathBuf::from_str(&out_dir).unwrap();
+        let mut top_path = PathBuf::new();
+        for i in out_path.iter() {
+            if i == OsStr::new("target") {
+                break;
+            }
+            top_path.push(i);
+        }
+
         let manifest_path = env::var("CARGO_MANIFEST_DIR").unwrap();
         let manifest_path = PathBuf::from_str(&manifest_path).unwrap();
 
         let los_path = env::var("CARGO_CFG_LOS_PATH").unwrap();
-        let los_path = pwd.join(&los_path);
+        let los_path = top_path.join(&los_path).canonicalize().unwrap();
 
         let fs = File::options()
             .read(true)
             .open(los_path.join(".config"))
             .unwrap();
+
         let fs = BufReader::new(fs);
-        println!("{}",manifest_path.join("src/liteos/config.rs").to_str().unwrap());
         let mut fcfg = File::options()
             .write(true)
             .create(true)
             .truncate(true)
             .open(manifest_path.join("src/liteos/config.rs"))
             .unwrap();
+            
         let is_empty_line = Regex::new(r"^ *?#|^ *?$").unwrap();
         let kv = Regex::new(r#"^ *?(\w+) *?= *?(.*)$"#).unwrap();
 
@@ -58,6 +68,10 @@ fn main() {
             "cargo:rerun-if-changed={}",
             los_path.join(".config").to_str().unwrap()
         );
+        println!(
+            "cargo:rerun-if-changed={}",
+            top_path.join(".cargo/config.toml").to_str().unwrap()
+        )
     }
     println!("cargo:rerun-if-changed=build.rs");
 }