diff --git a/.github/workflows/dev-build.yml b/.github/workflows/dev-build.yml
index 7dbfcc1..80ce07b 100644
--- a/.github/workflows/dev-build.yml
+++ b/.github/workflows/dev-build.yml
@@ -21,7 +21,7 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v2
     - name: Build
-      run: mkdir dist && go build -o dist
+      run: mkdir dist && go build -tags "full" -o dist
     - name: Upload Binary
       uses: actions/upload-artifact@v1
       with:
diff --git a/build-all.sh b/build-all.sh
index b7bff33..7fd5504 100755
--- a/build-all.sh
+++ b/build-all.sh
@@ -35,7 +35,7 @@ for PLATFORM in $PLATFORMS; do
   GOOS=${PLATFORM%/*}
   GOARCH=${PLATFORM#*/}
   ZIP_FILENAME="trojan-go-${GOOS}-${GOARCH}.zip"
-  CMD="CGO_ENABLE=0 GOOS=${GOOS} GOARCH=${GOARCH} go build -o temp $@ -ldflags=\"-s -w\""
+  CMD="CGO_ENABLE=0 GOOS=${GOOS} GOARCH=${GOARCH} go build -tags \"full\" -o temp $@ -ldflags=\"-s -w\""
   echo "${CMD}"
   eval $CMD || FAILURES="${FAILURES} ${PLATFORM}"
   zip -j release/$ZIP_FILENAME temp/* ./*.dat
diff --git a/build.sh b/build.sh
index cc6d4c0..79d1501 100755
--- a/build.sh
+++ b/build.sh
@@ -1 +1 @@
-CGO_ENABLE=0 go build -ldflags="-s -w"
+CGO_ENABLE=0 go build -tags "full" -ldflags="-s -w"
diff --git a/build/api.go b/build/api.go
new file mode 100644
index 0000000..8ca581b
--- /dev/null
+++ b/build/api.go
@@ -0,0 +1,7 @@
+// +build api full
+
+package build
+
+import (
+	_ "github.com/p4gefau1t/trojan-go/api"
+)
diff --git a/build/cert.go b/build/cert.go
new file mode 100644
index 0000000..7ac84e5
--- /dev/null
+++ b/build/cert.go
@@ -0,0 +1,7 @@
+// +build cert full
+
+package build
+
+import (
+	_ "github.com/p4gefau1t/trojan-go/cert"
+)
diff --git a/build/client.go b/build/client.go
new file mode 100644
index 0000000..f855ca0
--- /dev/null
+++ b/build/client.go
@@ -0,0 +1,7 @@
+// +build client full
+
+package build
+
+import (
+	_ "github.com/p4gefau1t/trojan-go/proxy/client"
+)
diff --git a/build/full.go b/build/full.go
new file mode 100644
index 0000000..2b03b29
--- /dev/null
+++ b/build/full.go
@@ -0,0 +1,8 @@
+// +build full
+
+package build
+
+import (
+	_ "github.com/p4gefau1t/trojan-go/daemon"
+	_ "github.com/p4gefau1t/trojan-go/easy"
+)
diff --git a/build/mysql.go b/build/mysql.go
new file mode 100644
index 0000000..47c71e7
--- /dev/null
+++ b/build/mysql.go
@@ -0,0 +1,7 @@
+// +build mysql full
+
+package build
+
+import (
+	_ "github.com/p4gefau1t/trojan-go/stat/mysql"
+)
diff --git a/build/relay.go b/build/relay.go
new file mode 100644
index 0000000..3643225
--- /dev/null
+++ b/build/relay.go
@@ -0,0 +1,7 @@
+// +build relay full
+
+package build
+
+import (
+	_ "github.com/p4gefau1t/trojan-go/proxy/relay"
+)
diff --git a/build/router.go b/build/router.go
new file mode 100644
index 0000000..365d161
--- /dev/null
+++ b/build/router.go
@@ -0,0 +1,7 @@
+// +build router full
+
+package build
+
+import (
+	_ "github.com/p4gefau1t/trojan-go/router/mixed"
+)
diff --git a/build/server.go b/build/server.go
new file mode 100644
index 0000000..e980c3e
--- /dev/null
+++ b/build/server.go
@@ -0,0 +1,7 @@
+// +build server full
+
+package build
+
+import (
+	_ "github.com/p4gefau1t/trojan-go/proxy/server"
+)
diff --git a/main.go b/main.go
index 5d02248..e7c637e 100644
--- a/main.go
+++ b/main.go
@@ -5,22 +5,13 @@ import (
 
 	"github.com/p4gefau1t/trojan-go/common"
 	"github.com/p4gefau1t/trojan-go/log"
-
-	//the following modules are optional
-	//you can comment some of them if you don't need them
-	_ "github.com/p4gefau1t/trojan-go/api"
-	_ "github.com/p4gefau1t/trojan-go/cert"
-	_ "github.com/p4gefau1t/trojan-go/daemon"
-	_ "github.com/p4gefau1t/trojan-go/easy"
-	_ "github.com/p4gefau1t/trojan-go/log/golog"
-	_ "github.com/p4gefau1t/trojan-go/proxy/client"
-	_ "github.com/p4gefau1t/trojan-go/proxy/relay"
-	_ "github.com/p4gefau1t/trojan-go/proxy/server"
-	_ "github.com/p4gefau1t/trojan-go/router/mixed"
-	_ "github.com/p4gefau1t/trojan-go/stat/db"
+		
 	_ "github.com/p4gefau1t/trojan-go/stat/memory"
+	_ "github.com/p4gefau1t/trojan-go/log/golog"
 	_ "github.com/p4gefau1t/trojan-go/version"
 	//_ "github.com/p4gefau1t/trojan-go/log/simplelog"
+
+	_ "github.com/p4gefau1t/trojan-go/build"
 )
 
 func main() {
diff --git a/stat/db/db.go b/stat/mysql/mysql.go
similarity index 99%
rename from stat/db/db.go
rename to stat/mysql/mysql.go
index da99681..e9885ac 100644
--- a/stat/db/db.go
+++ b/stat/mysql/mysql.go
@@ -1,4 +1,4 @@
-package db
+package mysql
 
 import (
 	"context"
diff --git a/stat/db/db_test.go b/stat/mysql/mysql_test.go
similarity index 98%
rename from stat/db/db_test.go
rename to stat/mysql/mysql_test.go
index 3f396ae..6908d10 100644
--- a/stat/db/db_test.go
+++ b/stat/mysql/mysql_test.go
@@ -1,4 +1,4 @@
-package db
+package mysql
 
 import (
 	"context"
diff --git a/update/update.go b/update/update.go
deleted file mode 100644
index 928bf8c..0000000
--- a/update/update.go
+++ /dev/null
@@ -1,50 +0,0 @@
-package update
-
-import (
-	"io"
-	"net/http"
-	"os"
-
-	"github.com/p4gefau1t/trojan-go/common"
-)
-
-func downloadFile(url string, filepath string) error {
-	resp, err := http.Get(url)
-	if err != nil {
-		return err
-	}
-	defer resp.Body.Close()
-
-	out, err := os.Create(filepath)
-	if err != nil {
-		return err
-	}
-	defer out.Close()
-
-	_, err = io.Copy(out, resp.Body)
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
-func downloadGeoSite() error {
-	filename := "geosite.dat"
-	url := "https://github.com/v2ray/domain-list-community/raw/release/dlc.dat"
-	return downloadFile(url, filename)
-}
-
-func downloadGeoIP() error {
-	filename := "geoip.dat"
-	url := "https://raw.githubusercontent.com/v2ray/geoip/release/geoip.dat"
-	return downloadFile(url, filename)
-}
-
-type updateOption struct {
-	args *string
-	common.OptionHandler
-}
-
-func init() {
-	// TODO auto updating
-}