diff --git a/code/rest/dav_controller.go b/code/rest/dav_controller.go
index 0d980d7..b302c7f 100644
--- a/code/rest/dav_controller.go
+++ b/code/rest/dav_controller.go
@@ -18,7 +18,7 @@ import (
  * WebDav document
  * https://tools.ietf.org/html/rfc4918
  * http://www.webdav.org/specs/rfc4918.html
- *
+ * test machine: http://www.webdav.org/neon/litmus/
  */
 
 type DavController struct {
@@ -145,7 +145,7 @@ func (this *DavController) debug(writer http.ResponseWriter, request *http.Reque
 
 	bodyBytes, err := ioutil.ReadAll(request.Body)
 	if err != nil {
-		fmt.Println("读取body时出错" + err.Error())
+		fmt.Println("occur error when reading body: " + err.Error())
 	}
 	fmt.Println(string(bodyBytes))
 
@@ -162,7 +162,8 @@ func (this *DavController) debug(writer http.ResponseWriter, request *http.Reque
 
 func (this *DavController) Index(writer http.ResponseWriter, request *http.Request, subPath string) {
 
-	//this.debug(writer, request, subPath)
+	//when debugging. open it.
+	this.debug(writer, request, subPath)
 
 	user := this.CheckCurrentUser(writer, request)
 
diff --git a/code/rest/dav_service.go b/code/rest/dav_service.go
index 4106e71..eabdfee 100644
--- a/code/rest/dav_service.go
+++ b/code/rest/dav_service.go
@@ -7,6 +7,7 @@ import (
 	"github.com/eyebluecn/tank/code/tool/dav/xml"
 	"github.com/eyebluecn/tank/code/tool/result"
 	"github.com/eyebluecn/tank/code/tool/util"
+	"io/ioutil"
 	"net/http"
 	"net/url"
 	"path"
@@ -230,6 +231,9 @@ func (this *DavService) HandlePut(writer http.ResponseWriter, request *http.Requ
 
 	this.matterService.Upload(request, request.Body, user, dirMatter, filename, true)
 
+	//set the status code 201
+	writer.WriteHeader(http.StatusCreated)
+
 }
 
 //delete file
@@ -247,10 +251,37 @@ func (this *DavService) HandleMkcol(writer http.ResponseWriter, request *http.Re
 
 	fmt.Printf("MKCOL %s\n", subPath)
 
+	//the body of MKCOL request MUST be empty. (RFC2518:8.3.1)
+	bodyBytes, err := ioutil.ReadAll(request.Body)
+	if err != nil {
+		fmt.Println("occur error when reading body: " + err.Error())
+	} else {
+		if len(bodyBytes) != 0 {
+			//throw conflict error
+			panic(result.CustomWebResult(result.UNSUPPORTED_MEDIA_TYPE, fmt.Sprintf("%s MKCOL should NO body", subPath)))
+		}
+	}
+
 	thisDirName := util.GetFilenameOfPath(subPath)
 	dirPath := util.GetDirOfPath(subPath)
 
-	dirMatter := this.matterDao.CheckWithRootByPath(dirPath, user)
+	dirMatter := this.matterDao.FindWithRootByPath(dirPath, user)
+	if dirMatter == nil {
+		//throw conflict error
+		panic(result.CustomWebResult(result.CONFLICT, fmt.Sprintf("%s not exist", dirPath)))
+	}
+
+	//check whether col exists. (RFC2518:8.3.1)
+	dbMatter := this.matterDao.FindByUserUuidAndPuuidAndDirAndName(user.Uuid, dirMatter.Uuid, true, thisDirName)
+	if dbMatter != nil {
+		panic(result.CustomWebResult(result.METHOD_NOT_ALLOWED, fmt.Sprintf("%s already exists", dirPath)))
+	}
+
+	//check whether file exists. (RFC2518:8.3.1)
+	fileMatter := this.matterDao.FindByUserUuidAndPuuidAndDirAndName(user.Uuid, dirMatter.Uuid, false, thisDirName)
+	if fileMatter != nil {
+		panic(result.CustomWebResult(result.METHOD_NOT_ALLOWED, fmt.Sprintf("%s file already exists", dirPath)))
+	}
 
 	this.matterService.AtomicCreateDirectory(request, dirMatter, thisDirName, user)
 
diff --git a/code/rest/matter_dao.go b/code/rest/matter_dao.go
index 23ffbd2..69d91e0 100644
--- a/code/rest/matter_dao.go
+++ b/code/rest/matter_dao.go
@@ -92,6 +92,24 @@ func (this *MatterDao) CheckWithRootByPath(path string, user *User) *Matter {
 	return matter
 }
 
+// find by path. if path=/, then return the Root Matter
+func (this *MatterDao) FindWithRootByPath(path string, user *User) *Matter {
+
+	var matter *Matter
+
+	if user == nil {
+		panic(result.BadRequest("user cannot be null."))
+	}
+
+	if path == "" || path == "/" {
+		matter = NewRootMatter(user)
+	} else {
+		matter = this.findByUserUuidAndPath(user.Uuid, path)
+	}
+
+	return matter
+}
+
 func (this *MatterDao) FindByUserUuidAndPuuidAndNameAndDirTrue(userUuid string, puuid string, name string) *Matter {
 
 	var wp = &builder.WherePair{}
@@ -417,6 +435,7 @@ func (this *MatterDao) SizeBetweenTime(startTime time.Time, endTime time.Time) i
 	return size
 }
 
+//find by userUuid and path. if not found, return nil
 func (this *MatterDao) findByUserUuidAndPath(userUuid string, path string) *Matter {
 
 	var wp = &builder.WherePair{Query: "user_uuid = ? AND path = ?", Args: []interface{}{userUuid, path}}
@@ -435,6 +454,7 @@ func (this *MatterDao) findByUserUuidAndPath(userUuid string, path string) *Matt
 	return matter
 }
 
+//find by userUuid and path. if not found, panic
 func (this *MatterDao) checkByUserUuidAndPath(userUuid string, path string) *Matter {
 
 	if path == "" {
diff --git a/code/tool/result/web_result.go b/code/tool/result/web_result.go
index d989862..13ed050 100644
--- a/code/tool/result/web_result.go
+++ b/code/tool/result/web_result.go
@@ -23,18 +23,21 @@ type CodeWrapper struct {
 }
 
 var (
-	OK                    = &CodeWrapper{Code: "OK", HttpStatus: http.StatusOK, Description: "ok"}
-	BAD_REQUEST           = &CodeWrapper{Code: "BAD_REQUEST", HttpStatus: http.StatusBadRequest, Description: "bad request"}
-	NEED_SHARE_CODE       = &CodeWrapper{Code: "NEED_SHARE_CODE", HttpStatus: http.StatusUnauthorized, Description: "share code required"}
-	SHARE_CODE_ERROR      = &CodeWrapper{Code: "SHARE_CODE_ERROR", HttpStatus: http.StatusUnauthorized, Description: "share code error"}
-	LOGIN                 = &CodeWrapper{Code: "LOGIN", HttpStatus: http.StatusUnauthorized, Description: "not login"}
-	USER_DISABLED         = &CodeWrapper{Code: "USER_DISABLED", HttpStatus: http.StatusForbidden, Description: "user disabled"}
-	UNAUTHORIZED          = &CodeWrapper{Code: "UNAUTHORIZED", HttpStatus: http.StatusUnauthorized, Description: "unauthorized"}
-	NOT_FOUND             = &CodeWrapper{Code: "NOT_FOUND", HttpStatus: http.StatusNotFound, Description: "404 not found"}
-	RANGE_NOT_SATISFIABLE = &CodeWrapper{Code: "RANGE_NOT_SATISFIABLE", HttpStatus: http.StatusRequestedRangeNotSatisfiable, Description: "range not satisfiable"}
-	NOT_INSTALLED         = &CodeWrapper{Code: "NOT_INSTALLED", HttpStatus: http.StatusInternalServerError, Description: "application not installed"}
-	SERVER                = &CodeWrapper{Code: "SERVER", HttpStatus: http.StatusInternalServerError, Description: "server error"}
-	UNKNOWN               = &CodeWrapper{Code: "UNKNOWN", HttpStatus: http.StatusInternalServerError, Description: "server unknow error"}
+	OK                     = &CodeWrapper{Code: "OK", HttpStatus: http.StatusOK, Description: "ok"}
+	BAD_REQUEST            = &CodeWrapper{Code: "BAD_REQUEST", HttpStatus: http.StatusBadRequest, Description: "bad request"}
+	NEED_SHARE_CODE        = &CodeWrapper{Code: "NEED_SHARE_CODE", HttpStatus: http.StatusUnauthorized, Description: "share code required"}
+	SHARE_CODE_ERROR       = &CodeWrapper{Code: "SHARE_CODE_ERROR", HttpStatus: http.StatusUnauthorized, Description: "share code error"}
+	LOGIN                  = &CodeWrapper{Code: "LOGIN", HttpStatus: http.StatusUnauthorized, Description: "not login"}
+	USER_DISABLED          = &CodeWrapper{Code: "USER_DISABLED", HttpStatus: http.StatusForbidden, Description: "user disabled"}
+	UNAUTHORIZED           = &CodeWrapper{Code: "UNAUTHORIZED", HttpStatus: http.StatusUnauthorized, Description: "unauthorized"}
+	NOT_FOUND              = &CodeWrapper{Code: "NOT_FOUND", HttpStatus: http.StatusNotFound, Description: "404 not found"}
+	METHOD_NOT_ALLOWED     = &CodeWrapper{Code: "METHOD_NOT_ALLOWED", HttpStatus: http.StatusMethodNotAllowed, Description: "405 method not allowed"}
+	CONFLICT               = &CodeWrapper{Code: "CONFLICT", HttpStatus: http.StatusConflict, Description: "409 conflict"}
+	UNSUPPORTED_MEDIA_TYPE = &CodeWrapper{Code: "UNSUPPORTED_MEDIA_TYPE", HttpStatus: http.StatusUnsupportedMediaType, Description: "415 conflict"}
+	RANGE_NOT_SATISFIABLE  = &CodeWrapper{Code: "RANGE_NOT_SATISFIABLE", HttpStatus: http.StatusRequestedRangeNotSatisfiable, Description: "range not satisfiable"}
+	NOT_INSTALLED          = &CodeWrapper{Code: "NOT_INSTALLED", HttpStatus: http.StatusInternalServerError, Description: "application not installed"}
+	SERVER                 = &CodeWrapper{Code: "SERVER", HttpStatus: http.StatusInternalServerError, Description: "server error"}
+	UNKNOWN                = &CodeWrapper{Code: "UNKNOWN", HttpStatus: http.StatusInternalServerError, Description: "server unknow error"}
 )
 
 func FetchHttpStatus(code string) int {
@@ -54,6 +57,12 @@ func FetchHttpStatus(code string) int {
 		return UNAUTHORIZED.HttpStatus
 	} else if code == NOT_FOUND.Code {
 		return NOT_FOUND.HttpStatus
+	} else if code == METHOD_NOT_ALLOWED.Code {
+		return METHOD_NOT_ALLOWED.HttpStatus
+	} else if code == CONFLICT.Code {
+		return CONFLICT.HttpStatus
+	} else if code == UNSUPPORTED_MEDIA_TYPE.Code {
+		return UNSUPPORTED_MEDIA_TYPE.HttpStatus
 	} else if code == RANGE_NOT_SATISFIABLE.Code {
 		return RANGE_NOT_SATISFIABLE.HttpStatus
 	} else if code == NOT_INSTALLED.Code {