diff --git a/check.go b/check.go
index c8007bef4..a4fa71dee 100644
--- a/check.go
+++ b/check.go
@@ -7,7 +7,6 @@ package main
 import (
 	"fmt"
 	"os"
-	"runtime"
 	"strings"
 
 	"github.com/GPMGo/gpm/doc"
@@ -20,13 +19,17 @@ var cmdCheck = &Command{
 
 func init() {
 	cmdCheck.Run = runCheck
+	cmdCheck.Flags = map[string]bool{
+		"-e": false,
+	}
 }
 
 // printCheckPrompt prints prompt information to users to
 // let them know what's going on.
 func printCheckPrompt(flag string) {
 	switch flag {
-
+	case "-e":
+		fmt.Printf(fmt.Sprintf("%s\n", promptMsg["CheckExDeps"]))
 	}
 }
 
@@ -42,14 +45,14 @@ func runCheck(cmd *Command, args []string) {
 	// Guess import path.
 	gopath := utils.GetBestMatchGOPATH(wd) + "/src/"
 	if len(wd) <= len(gopath) {
-		fmt.Printf(fmt.Sprintf("%s\n", promptMsg["InvalidPath"]))
+		fmt.Printf(fmt.Sprintf("runCheck -> %s\n", promptMsg["InvalidPath"]))
 		return
 	}
 
 	importPath := wd[len(gopath):]
-	imports, err := doc.CheckImports(wd+"/", importPath)
+	imports, err := checkImportsByRoot(wd+"/", importPath)
 	if err != nil {
-		fmt.Printf(fmt.Sprintf("%s\n", promptMsg["CheckImports"]), err)
+		fmt.Printf(fmt.Sprintf("runCheck -> %s\n", promptMsg["CheckImports"]), err)
 		return
 	}
 
@@ -57,6 +60,7 @@ func runCheck(cmd *Command, args []string) {
 		return
 	}
 
+	importsCache := make(map[string]bool)
 	uninstallList := make([]string, 0)
 	isInstalled := false
 	// Check if dependencies have been installed.
@@ -66,16 +70,18 @@ func runCheck(cmd *Command, args []string) {
 		// Make sure it doesn't belong to same project.
 		if utils.GetProjectPath(v) != utils.GetProjectPath(importPath) {
 			for _, p := range paths {
-				if utils.IsExist(p + "/src/" + v + "/") {
+				if checkIsExistWithVCS(p + "/src/" + v + "/") {
 					isInstalled = true
 					break
 				}
 			}
 
-			if !isInstalled {
+			if !isInstalled && !importsCache[v] {
+				importsCache[v] = true
 				uninstallList = append(uninstallList, v)
 			}
 		}
+		isInstalled = false
 	}
 
 	// Check if need to install packages.
@@ -102,21 +108,13 @@ func runCheck(cmd *Command, args []string) {
 		// Download packages.
 		downloadPackages(nodes)
 
+		removePackageFiles("", uninstallList)
+
 		// Install packages all together.
 		var cmdArgs []string
 		cmdArgs = append(cmdArgs, "install")
 		cmdArgs = append(cmdArgs, "<blank>")
 
-		paths := utils.GetGOPATH()
-		pkgPath := "/pkg/" + runtime.GOOS + "_" + runtime.GOARCH + "/"
-		for _, k := range uninstallList {
-			// Delete old packages.
-			for _, p := range paths {
-				os.RemoveAll(p + pkgPath + k + "/")
-				os.Remove(p + pkgPath + k + ".a")
-			}
-		}
-
 		for _, k := range uninstallList {
 			fmt.Printf(fmt.Sprintf("%s\n", promptMsg["InstallStatus"]), k)
 			cmdArgs[1] = k
@@ -126,3 +124,60 @@ func runCheck(cmd *Command, args []string) {
 		// Generate configure file.
 	}
 }
+
+// checkImportsByRoot checks imports of packages from root path,
+// and recursion checks all sub-directories.
+func checkImportsByRoot(rootPath, importPath string) (imports []string, err error) {
+	// Check imports of root path.
+	importPkgs, err := doc.CheckImports(rootPath, importPath)
+	if err != nil {
+		return nil, err
+	}
+	imports = append(imports, importPkgs...)
+
+	// Check sub-directories.
+	dirs, err := utils.GetDirsInfo(rootPath)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, d := range dirs {
+		if d.IsDir() &&
+			!(!cmdCheck.Flags["-e"] && strings.Contains(d.Name(), "example")) {
+			importPkgs, err := checkImportsByRoot(rootPath+d.Name()+"/", importPath)
+			if err != nil {
+				return nil, err
+			}
+			imports = append(imports, importPkgs...)
+		}
+	}
+
+	return imports, err
+}
+
+// checkIsExistWithVCS returns false if directory only has VCS folder,
+// or doesn't exist.
+func checkIsExistWithVCS(path string) bool {
+	// Check if directory exist.
+	if !utils.IsExist(path) {
+		return false
+	}
+
+	// Check if only has VCS folder.
+	dirs, err := utils.GetDirsInfo(path)
+	if err != nil {
+		fmt.Printf("checkIsExistWithVCS -> [ %s ]", err)
+		return false
+	}
+
+	if len(dirs) != 1 {
+		return true
+	}
+
+	switch dirs[0].Name() {
+	case ".git", ".hg", ".svn":
+		return false
+	}
+
+	return true
+}
diff --git a/conf/gpm.toml b/conf/gpm.toml
index 5555f5cc3..f6d1d8122 100644
--- a/conf/gpm.toml
+++ b/conf/gpm.toml
@@ -1,7 +1,7 @@
 # This is a configuration file for gpm with toml format.
 
 title = "gpm(Go Package Manager)"
-version = "v0.2.1 Build 0524"
+version = "v0.2.2 Build 0524"
 user_language = "en-US"
 #user_language = "zh-CN"
 auto_backup = true
@@ -13,4 +13,7 @@ github_access_token = ""
 
 [auto_enable]
 build = []
-install = []
\ No newline at end of file
+install = []
+search = []
+remove = []
+check = []
\ No newline at end of file
diff --git a/doc/google.go b/doc/google.go
index f49e8a5a0..a0a19df07 100644
--- a/doc/google.go
+++ b/doc/google.go
@@ -152,13 +152,7 @@ func GetGoogleDoc(client *http.Client, match map[string]string, installGOPATH st
 
 	// Check if need to check imports.
 	if isCheckImport {
-		rootdir, err := os.Open(installPath + "/")
-		if err != nil {
-			return nil, err
-		}
-		defer rootdir.Close()
-
-		dirs, err := rootdir.Readdir(0)
+		dirs, err := utils.GetDirsInfo(installPath + "/")
 		if err != nil {
 			return nil, err
 		}
diff --git a/doc/walker.go b/doc/walker.go
index 4371a2fe2..e225bba81 100644
--- a/doc/walker.go
+++ b/doc/walker.go
@@ -124,6 +124,7 @@ func (w *walker) build(srcs []*source) ([]string, error) {
 		files[name] = file
 	}
 
+	w.ImportPath = strings.Replace(w.ImportPath, "\\", "/", -1)
 	var imports []string
 	for _, v := range bpkg.Imports {
 		// Skip strandard library.
diff --git a/i18n/en-US/prompt.txt b/i18n/en-US/prompt.txt
index 22174b006..b3cdf7086 100644
--- a/i18n/en-US/prompt.txt
+++ b/i18n/en-US/prompt.txt
@@ -33,4 +33,5 @@ RemovePackage=Removing package: %s.
 NoKeyword=Cannot search without a keyword.
 ContinueRemove=Continue to remove?(Y/n).
 InvalidPath=Cannot find package in current path.
-MissingImports=Following packages are missing:
\ No newline at end of file
+MissingImports=Following packages are missing:
+CheckExDeps=You enabled check dependencies in example.
\ No newline at end of file
diff --git a/i18n/en-US/usage_check.txt b/i18n/en-US/usage_check.txt
index 028dbdfe6..c6b45bb19 100644
--- a/i18n/en-US/usage_check.txt
+++ b/i18n/en-US/usage_check.txt
@@ -4,5 +4,7 @@ and generate configure file.
 
 The check flags are:
 
+	-e
+		check dependencies for examples.
 
 The list flags accept a space-separated list of strings.
\ No newline at end of file
diff --git a/i18n/zh-CN/prompt.txt b/i18n/zh-CN/prompt.txt
index 3bc857c3c..d3ae329f4 100644
--- a/i18n/zh-CN/prompt.txt
+++ b/i18n/zh-CN/prompt.txt
@@ -33,4 +33,5 @@ RemovePackage=正在删除包: %s.
 NoKeyword=没有关键字，无法搜索.
 ContinueRemove=是否继续删除？(Y/n).
 InvalidPath=无法在当前目录中找到包.
-MissingImports=下列依赖包未找到:
\ No newline at end of file
+MissingImports=下列依赖包未找到:
+CheckExDeps=已激活示例代码依赖检查.
\ No newline at end of file
diff --git a/i18n/zh-CN/usage_check.txt b/i18n/zh-CN/usage_check.txt
index 59b3f7c24..52e267b30 100644
--- a/i18n/zh-CN/usage_check.txt
+++ b/i18n/zh-CN/usage_check.txt
@@ -3,5 +3,7 @@ Check 命令用于检查并安装缺失的依赖包，并生成依赖配置文
 
 下列参数可用于 check 命令:
 
+	-e
+		检查示例代码的依赖包.
 
 多个参数通过空格来间隔.
diff --git a/install.go b/install.go
index 60aa121e0..0a2a10259 100644
--- a/install.go
+++ b/install.go
@@ -12,7 +12,6 @@ import (
 	"os"
 	"os/exec"
 	"regexp"
-	"runtime"
 	"strings"
 
 	"github.com/GPMGo/gpm/doc"
@@ -136,21 +135,18 @@ func runInstall(cmd *Command, args []string) {
 	downloadPackages(nodes)
 
 	if !cmdInstall.Flags["-d"] && cmdInstall.Flags["-p"] {
+		// Remove old files.
+		uninstallList := make([]string, 0, len(downloadCache))
+		for k := range downloadCache {
+			uninstallList = append(uninstallList, k)
+		}
+		removePackageFiles("", uninstallList)
+
 		// Install packages all together.
 		var cmdArgs []string
 		cmdArgs = append(cmdArgs, "install")
 		cmdArgs = append(cmdArgs, "<blank>")
 
-		paths := utils.GetGOPATH()
-		pkgPath := "/pkg/" + runtime.GOOS + "_" + runtime.GOARCH + "/"
-		for k := range downloadCache {
-			// Delete old packages.
-			for _, p := range paths {
-				os.RemoveAll(p + pkgPath + k + "/")
-				os.Remove(p + pkgPath + k + ".a")
-			}
-		}
-
 		for k := range downloadCache {
 			fmt.Printf(fmt.Sprintf("%s\n", promptMsg["InstallStatus"]), k)
 			cmdArgs[1] = k
diff --git a/remove.go b/remove.go
index 2a00a6558..9ae764196 100644
--- a/remove.go
+++ b/remove.go
@@ -142,18 +142,9 @@ func removePackage(node *doc.Node) (*doc.Node, []string) {
 				}
 			}
 
-			pkgPath := "/pkg/" + runtime.GOOS + "_" + runtime.GOARCH + "/" + node.ImportPath
-			// Remove file in GOPATH/pkg
-			if len(gopath) == 0 {
-				for _, v := range paths {
-					if utils.IsExist(v + pkgPath + "/") {
-						gopath = v
-					}
-				}
-			}
+			pkgList := []string{node.ImportPath}
+			removePackageFiles(gopath, pkgList)
 
-			os.RemoveAll(gopath + pkgPath + "/")
-			os.Remove(gopath + pkgPath + ".a")
 			return node, nil
 		}
 	}
@@ -162,3 +153,22 @@ func removePackage(node *doc.Node) (*doc.Node, []string) {
 	fmt.Printf(fmt.Sprintf("%s\n", promptMsg["PackageNotFound"]), node.ImportPath)
 	return nil, nil
 }
+
+// removePackageFiles removes package files in $GOPATH/pkg.
+func removePackageFiles(gopath string, pkgList []string) {
+	var paths []string
+	// Check if need to find GOPATH.
+	if len(gopath) == 0 {
+		paths = utils.GetGOPATH()
+	} else {
+		paths = append(paths, gopath)
+	}
+
+	pkgPath := "/pkg/" + runtime.GOOS + "_" + runtime.GOARCH + "/"
+	for _, p := range pkgList {
+		for _, g := range paths {
+			os.RemoveAll(g + pkgPath + p + "/")
+			os.Remove(g + pkgPath + p + ".a")
+		}
+	}
+}
diff --git a/utils/utils.go b/utils/utils.go
index d7685b207..9e859b4b1 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -592,3 +592,19 @@ func IsDocFile(n string) bool {
 
 	return readmePat.MatchString(n) || licensePat.MatchString(n)
 }
+
+// GetDirsInfo returns os.FileInfo of all sub-directories in root path.
+func GetDirsInfo(rootPath string) ([]os.FileInfo, error) {
+	rootDir, err := os.Open(rootPath)
+	if err != nil {
+		return nil, err
+	}
+	defer rootDir.Close()
+
+	dirs, err := rootDir.Readdir(0)
+	if err != nil {
+		return nil, err
+	}
+
+	return dirs, err
+}