diff --git a/CHANGELOG b/CHANGELOG
index 3ce05eb..9525b3b 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -55,6 +55,7 @@ TO RELEASE
 tank-3.1.0
 1. Add prop column into tank31_matter
 2. Add charset in mysql config.
+3. Add office_url.
 
 
 ALTER TABLE `tank`.`tank30_matter`
diff --git a/code/rest/preference_controller.go b/code/rest/preference_controller.go
index e327e31..0a52b96 100644
--- a/code/rest/preference_controller.go
+++ b/code/rest/preference_controller.go
@@ -72,6 +72,7 @@ func (this *PreferenceController) Edit(writer http.ResponseWriter, request *http
 	downloadDirMaxNumStr := request.FormValue("downloadDirMaxNum")
 	defaultTotalSizeLimitStr := request.FormValue("defaultTotalSizeLimit")
 	allowRegisterStr := request.FormValue("allowRegister")
+	officeUrl := request.FormValue("officeUrl")
 
 	if name == "" {
 		panic(result.BadRequest("name cannot be null"))
@@ -119,6 +120,7 @@ func (this *PreferenceController) Edit(writer http.ResponseWriter, request *http
 	preference.DownloadDirMaxNum = downloadDirMaxNum
 	preference.DefaultTotalSizeLimit = defaultTotalSizeLimit
 	preference.AllowRegister = allowRegister
+	preference.OfficeUrl = officeUrl
 
 	preference = this.preferenceDao.Save(preference)
 
diff --git a/code/rest/preference_dao.go b/code/rest/preference_dao.go
index f9eba04..97a616c 100644
--- a/code/rest/preference_dao.go
+++ b/code/rest/preference_dao.go
@@ -22,6 +22,8 @@ func (this *PreferenceDao) Fetch() *Preference {
 		if db.Error.Error() == result.DB_ERROR_NOT_FOUND {
 			preference.Name = "EyeblueTank"
 			preference.Version = core.VERSION
+			//Default Office preview url.
+			preference.OfficeUrl = "https://view.officeapps.live.com/op/embed.aspx?src="
 			this.Create(preference)
 			return preference
 		} else {
diff --git a/code/rest/preference_model.go b/code/rest/preference_model.go
index 4783192..b619775 100644
--- a/code/rest/preference_model.go
+++ b/code/rest/preference_model.go
@@ -13,6 +13,7 @@ type Preference struct {
 	DownloadDirMaxNum     int64  `json:"downloadDirMaxNum" gorm:"type:bigint(20) not null;default:-1"`
 	DefaultTotalSizeLimit int64  `json:"defaultTotalSizeLimit" gorm:"type:bigint(20) not null;default:-1"`
 	AllowRegister         bool   `json:"allowRegister" gorm:"type:tinyint(1) not null;default:0"`
+	OfficeUrl             string `json:"officeUrl" gorm:"type:varchar(255)"`
 	Version               string `json:"version" gorm:"-"`
 }