diff --git a/rest/alien_service.go b/rest/alien_service.go
index de778ef..fa4e459 100644
--- a/rest/alien_service.go
+++ b/rest/alien_service.go
@@ -128,7 +128,7 @@ func (this *AlienService) PreviewOrDownload(
 		this.matterService.DownloadFile(writer, request, GetUserCacheRootDir(imageCache.Username)+imageCache.Path, imageCache.Name, withContentDisposition)
 
 	} else {
-		this.matterService.DownloadFile(writer, request, GetUserFileRootDir(matter.Username)+matter.Path, matter.Name, withContentDisposition)
+		this.matterService.DownloadFile(writer, request, matter.AbsolutePath(), matter.Name, withContentDisposition)
 	}
 
 	//文件下载次数加一，为了加快访问速度，异步进行
diff --git a/rest/image_cache_dao.go b/rest/image_cache_dao.go
index 36ff388..d8cb95f 100644
--- a/rest/image_cache_dao.go
+++ b/rest/image_cache_dao.go
@@ -5,7 +5,7 @@ import (
 	"github.com/jinzhu/gorm"
 	"github.com/nu7hatch/gouuid"
 	"os"
-	"strings"
+	"path/filepath"
 	"time"
 )
 
@@ -140,10 +140,9 @@ func (this *ImageCacheDao) Save(imageCache *ImageCache) *ImageCache {
 //删除一个文件包括文件夹
 func (this *ImageCacheDao) deleteFileAndDir(imageCache *ImageCache) {
 
-	filePath := CONFIG.MatterPath + imageCache.Path
-	//递归找寻文件的上级目录uuid. 因为是/开头的缘故
-	parts := strings.Split(imageCache.Path, "/")
-	dirPath := CONFIG.MatterPath + "/" + parts[1] + "/" + parts[2] + "/" + parts[3] + "/" + parts[4]
+	filePath := GetUserCacheRootDir(imageCache.Username) + imageCache.Path
+
+	dirPath := filepath.Dir(filePath)
 
 	//删除文件
 	err := os.Remove(filePath)
@@ -151,11 +150,9 @@ func (this *ImageCacheDao) deleteFileAndDir(imageCache *ImageCache) {
 		this.logger.Error(fmt.Sprintf("删除磁盘上的文件%s出错 %s", filePath, err.Error()))
 	}
 
-	//删除这一层文件夹
-	err = os.Remove(dirPath)
-	if err != nil {
-		this.logger.Error(fmt.Sprintf("删除磁盘上的文件夹%s出错 %s", dirPath, err.Error()))
-	}
+	//如果这一层文件夹是空的，那么删除文件夹本身。
+	DeleteEmptyDir(dirPath)
+
 }
 
 //删除一个文件，数据库中删除，物理磁盘上删除。
diff --git a/rest/image_cache_model.go b/rest/image_cache_model.go
index 066f45c..b648f8f 100644
--- a/rest/image_cache_model.go
+++ b/rest/image_cache_model.go
@@ -20,3 +20,8 @@ type ImageCache struct {
 func (this *ImageCache) TableName() string {
 	return TABLE_PREFIX + "image_cache"
 }
+
+// 获取该ImageCache的绝对路径。path代表的是相对路径。
+func (this *ImageCache) AbsolutePath() string {
+	return GetUserCacheRootDir(this.Username) + this.Path
+}
diff --git a/rest/image_cache_service.go b/rest/image_cache_service.go
index dca1e9c..a28f892 100644
--- a/rest/image_cache_service.go
+++ b/rest/image_cache_service.go
@@ -195,7 +195,7 @@ func (this *ImageCacheService) cacheImage(writer http.ResponseWriter, request *h
 	user := this.userDao.FindByUuid(matter.UserUuid)
 
 	//resize图片
-	dstImage := this.ResizeImage(request, GetUserFileRootDir(user.Username)+matter.Path)
+	dstImage := this.ResizeImage(request, matter.AbsolutePath())
 
 	cacheImageName := GetSimpleFileName(matter.Name) + "_" + mode + extension
 	cacheImageRelativePath := GetSimpleFileName(matter.Path) + "_" + mode + extension
diff --git a/rest/matter_dao.go b/rest/matter_dao.go
index 42e91d4..4bc433b 100644
--- a/rest/matter_dao.go
+++ b/rest/matter_dao.go
@@ -2,10 +2,10 @@ package rest
 
 import (
 	"github.com/jinzhu/gorm"
+	"path/filepath"
 
 	"github.com/nu7hatch/gouuid"
 	"os"
-	"strings"
 	"time"
 )
 
@@ -239,17 +239,16 @@ func (this *MatterDao) Delete(matter *Matter) {
 			this.Delete(f)
 		}
 
-		//从磁盘中删除该文件夹。
-		removeError := os.Remove(CONFIG.MatterPath + matter.Path)
-		if removeError != nil {
-			this.logger.Error("从磁盘上删除文件夹%s出错：%s", CONFIG.MatterPath+matter.Path, removeError.Error())
-		}
-
-		//删除文件夹本身
+		//删除数据库中文件夹本身
 		db := CONTEXT.DB.Delete(&matter)
 		this.PanicError(db.Error)
 
+		//从磁盘中删除该文件夹。
+		DeleteEmptyDir(matter.AbsolutePath())
+
+
 	} else {
+
 		//删除数据库中文件记录
 		db := CONTEXT.DB.Delete(&matter)
 		this.PanicError(db.Error)
@@ -257,25 +256,15 @@ func (this *MatterDao) Delete(matter *Matter) {
 		//删除对应的缓存图片。
 		this.imageCacheDao.DeleteByMatterUuid(matter.Uuid)
 
-		filePath := CONFIG.MatterPath + matter.Path
-
-
-		//TODO: do it here.
-		//递归找寻文件的上级目录uuid. 因为是/开头的缘故
-		parts := strings.Split(matter.Path, "/")
-		dirPath := CONFIG.MatterPath + "/" + parts[1] + "/" + parts[2] + "/" + parts[3]
-
 		//删除文件
-		err := os.Remove(filePath)
+		err := os.Remove(matter.AbsolutePath())
 		if err != nil {
 			this.logger.Error("删除磁盘上的文件出错 %s", err.Error())
 		}
 
-		//删除这一层文件夹
-		err = os.Remove(dirPath)
-		if err != nil {
-			this.logger.Error("删除磁盘上的文件夹出错 %s", err.Error())
-		}
+		//如果目录为空，那么一并删除
+		dirPath := filepath.Dir(matter.AbsolutePath())
+		DeleteEmptyDir(dirPath)
 
 	}
 }
@@ -294,6 +283,7 @@ func (this *MatterDao) SizeBetweenTime(startTime time.Time, endTime time.Time) i
 	db := CONTEXT.DB.Model(&Matter{}).Where("create_time >= ? AND create_time <= ?", startTime, endTime).Select("SUM(size)")
 	this.PanicError(db.Error)
 	row := db.Row()
-	row.Scan(&size)
+	err := row.Scan(&size)
+	this.PanicError(err)
 	return size
 }
diff --git a/rest/matter_model.go b/rest/matter_model.go
index d23044c..4fc6b66 100644
--- a/rest/matter_model.go
+++ b/rest/matter_model.go
@@ -29,8 +29,7 @@ func (Matter) TableName() string {
 	return TABLE_PREFIX + "matter"
 }
 
-
-// 获取该Matter的绝对路径。path代表的是相对路径。相对路径的根目录是 CONFIG.MatterPath
+// 获取该Matter的绝对路径。path代表的是相对路径。
 func (this *Matter) AbsolutePath() string {
-	return CONFIG.MatterPath + this.Path
+	return GetUserFileRootDir(this.Username) + this.Path
 }
diff --git a/rest/util_path.go b/rest/util_path.go
index b01934f..a4e9458 100644
--- a/rest/util_path.go
+++ b/rest/util_path.go
@@ -3,6 +3,7 @@ package rest
 import (
 	"fmt"
 	"go/build"
+	"io/ioutil"
 	"os"
 	"os/user"
 	"path/filepath"
@@ -91,6 +92,25 @@ func MakeDirAll(dirPath string) string {
 	return dirPath
 }
 
+//尝试删除空文件夹
+func DeleteEmptyDir(dirPath string) {
+	dir, err := ioutil.ReadDir(dirPath)
+	if err != nil {
+		LOGGER.Error("尝试读取目录%s时出错 %s", dirPath, err.Error())
+		panic("尝试读取目录时出错 " + err.Error())
+	}
+
+	if len(dir) == 0 {
+		//空文件夹
+		err = os.Remove(dirPath)
+		if err != nil {
+			LOGGER.Error("删除磁盘上的文件夹%s出错 %s", dirPath, err.Error())
+		}
+	} else {
+		LOGGER.Info("文件夹不为空，%v", len(dir))
+	}
+}
+
 //移除某个文件夹。 例如：/var/www/matter => /var/www
 func RemoveDirectory(dirPath string) string {