diff --git a/src/index.ts b/src/index.ts
index 99aeaaf..f87cc70 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,3 +1,4 @@
+import cd from './lib/cd';
 import cp_r from './lib/cp_r';
 import ls from './lib/ls';
 import mkdir_p from './lib/mkdir_p';
@@ -10,6 +11,7 @@ import rm_rf from './lib/rm_rf';
 declare var wx: any;
 
 const Fileutils = {
+  cd,
   cp_r,
   ls,
   mkdir_p,
diff --git a/src/lib/cd.ts b/src/lib/cd.ts
new file mode 100644
index 0000000..9d2d907
--- /dev/null
+++ b/src/lib/cd.ts
@@ -0,0 +1,3 @@
+export default (dir) => {
+  return process.chdir(dir);
+};