diff --git a/authz/authz.go b/authz/authz.go
index a615b2f9..43027791 100644
--- a/authz/authz.go
+++ b/authz/authz.go
@@ -27,7 +27,7 @@ var Enforcer *casbin.Enforcer
 func InitAuthz() {
 	var err error
 
-	a, err := xormadapter.NewAdapter("mysql", beego.AppConfig.String("dataSourceName")+beego.AppConfig.String("dbName"), true)
+	a, err := xormadapter.NewAdapter(beego.AppConfig.String("db"), beego.AppConfig.String("dataSourceName")+beego.AppConfig.String("dbName"), true)
 	if err != nil {
 		panic(err)
 	}
diff --git a/conf/app.conf b/conf/app.conf
index 4a801370..a28f15a6 100644
--- a/conf/app.conf
+++ b/conf/app.conf
@@ -3,6 +3,7 @@ httpport = 8000
 runmode = dev
 SessionOn = true
 copyrequestbody = true
+db = mysql
 dataSourceName = root:123@tcp(localhost:3306)/
 dbName = casdoor
 AuthState = "casdoor"
diff --git a/go.mod b/go.mod
index 77f5f3cb..363a52a8 100644
--- a/go.mod
+++ b/go.mod
@@ -14,7 +14,6 @@ require (
 	github.com/google/uuid v1.2.0
 	github.com/jinzhu/configor v1.2.1 // indirect
 	github.com/qiangmzsx/string-adapter/v2 v2.1.0
-	github.com/qiniu/api.v7 v7.2.5+incompatible // indirect
 	github.com/qor/oss v0.0.0-20191031055114-aef9ba66bf76
 	github.com/satori/go.uuid v1.2.0 // indirect
 	github.com/smartystreets/goconvey v1.6.4 // indirect
diff --git a/go.sum b/go.sum
index df4ba542..40b48ff2 100644
--- a/go.sum
+++ b/go.sum
@@ -13,7 +13,6 @@ github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRF
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alicebob/gopher-json v0.0.0-20180125190556-5a6b3ba71ee6/go.mod h1:SGnFV6hVsYE877CKEZ6tDNTjaSXYUk6QqoIK6PrAtcc=
 github.com/alicebob/miniredis v2.5.0+incompatible/go.mod h1:8HZjEj4yU0dwhYHky+DxYx+6BMjkBbe5ONFIF1MXffk=
-github.com/aliyun/aliyun-oss-go-sdk v1.9.8 h1:BOflvK0Zs/zGmoabyFIzTg5c3kguktWTXEwewwbuba0=
 github.com/aliyun/aliyun-oss-go-sdk v2.1.6+incompatible h1:Ft+KeWIJxFP76LqgJbvtOA1qBIoC8vGkTV3QeCOeJC4=
 github.com/aliyun/aliyun-oss-go-sdk v2.1.6+incompatible/go.mod h1:T/Aws4fEfogEE9v+HPhhw+CntffsBHJ8nXQCwKr0/g8=
 github.com/andybalholm/cascadia v1.1.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
@@ -165,9 +164,6 @@ github.com/prometheus/procfs v0.1.3 h1:F0+tqvhOksq22sc6iCHF5WGlWjdwj92p0udFh1VFB
 github.com/prometheus/procfs v0.1.3/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU=
 github.com/qiangmzsx/string-adapter/v2 v2.1.0 h1:q0y8TPa/sTwtriJPRe8gWL++PuZ+XbOUuvKU+hvtTYs=
 github.com/qiangmzsx/string-adapter/v2 v2.1.0/go.mod h1:PElPB7b7HnGKTsuADAffFpOQXHqjEGJz1+U1a6yR5wA=
-github.com/qiniu/api.v7 v7.2.5+incompatible h1:6KKaGt7MbFzVGSniwzv7qsM/Qv0or4SkRJfmak8LqZE=
-github.com/qiniu/api.v7 v7.2.5+incompatible/go.mod h1:V8/EzlTgLN6q0s0CJmg/I81ytsvldSF22F7h6MI02+c=
-github.com/qiniu/x v1.11.5 h1:TYr5cl4g2yoHAZeDK4MTjKF6CMoG+IHlCDvvM5qym6U=
 github.com/qor/oss v0.0.0-20191031055114-aef9ba66bf76 h1:J2Xj92efYLxPl3BiibgEDEUiMsCBzwTurE/8JjD8CG4=
 github.com/qor/oss v0.0.0-20191031055114-aef9ba66bf76/go.mod h1:JhtPzUhP5KGtCB2yksmxuYAD4hEWw4qGQJpucjsm3U0=
 github.com/satori/go.uuid v1.2.0 h1:0uYX9dsZ2yD7q2RtLRtPSdGDWzjeM3TbMJP9utgA0ww=
@@ -243,8 +239,6 @@ golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f h1:+Nyd8tzPX9R7BWHguqsrbFdRx3WQ/1ib8I44HXV5yTA=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2 h1:z99zHgr7hKfrUcX/KsoJk5FJfjTceCKIp96+biqP4To=
-golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba h1:O8mE0/t419eoIwhTFpKVkHiTs/Igowgfkj25AcZrtiE=
diff --git a/object/adapter.go b/object/adapter.go
index 74abadb1..bd34aae4 100644
--- a/object/adapter.go
+++ b/object/adapter.go
@@ -19,7 +19,8 @@ import (
 	"runtime"
 
 	"github.com/astaxie/beego"
-	_ "github.com/go-sql-driver/mysql"
+	_ "github.com/go-sql-driver/mysql" // db = mysql
+	//_ "github.com/lib/pq"           // db = postgres
 	"xorm.io/xorm"
 )
 
@@ -35,7 +36,7 @@ func InitConfig() {
 }
 
 func InitAdapter() {
-	adapter = NewAdapter("mysql", beego.AppConfig.String("dataSourceName"))
+	adapter = NewAdapter(beego.AppConfig.String("db"), beego.AppConfig.String("dataSourceName"))
 }
 
 // Adapter represents the MySQL adapter for policy storage.
@@ -80,8 +81,10 @@ func (a *Adapter) createDatabase() error {
 }
 
 func (a *Adapter) open() {
-	if err := a.createDatabase(); err != nil {
-		panic(err)
+	if beego.AppConfig.String("db") != "postgres" {
+		if err := a.createDatabase(); err != nil {
+			panic(err)
+		}
 	}
 
 	engine, err := xorm.NewEngine(a.driverName, a.dataSourceName+beego.AppConfig.String("dbName"))