diff --git a/internal/decoder/api/decoder.go b/internal/decoder/api/decoder.go
index 5e31198e1..d591edb50 100644
--- a/internal/decoder/api/decoder.go
+++ b/internal/decoder/api/decoder.go
@@ -17,16 +17,23 @@
 package api
 
 import (
-    `reflect`
-
-    `github.com/bytedance/sonic/internal/native`
-    `github.com/bytedance/sonic/internal/native/types`
-	`github.com/bytedance/sonic/internal/decoder/consts`
-	`github.com/bytedance/sonic/internal/decoder/errors`
-    `github.com/bytedance/sonic/internal/rt`
-    `github.com/bytedance/sonic/option`
+	"reflect"
+
+	"github.com/bytedance/sonic/internal/decoder/consts"
+	"github.com/bytedance/sonic/internal/decoder/errors"
+	"github.com/bytedance/sonic/internal/decoder/optdec"
+	"github.com/bytedance/sonic/internal/native"
+	"github.com/bytedance/sonic/internal/native/types"
+	"github.com/bytedance/sonic/internal/rt"
+	"github.com/bytedance/sonic/option"
 )
 
+func ForceAllOpt() {
+	decodeImpl = optdec.Decode
+	pretouchImpl = optdec.Pretouch
+	rt.EnbaleFastMap = true
+}
+
 const (
 	_F_allow_control = consts.F_allow_control
 	_F_copy_string = consts.F_copy_string
diff --git a/sonic.go b/sonic.go
index a92981c41..7a88cc0a5 100644
--- a/sonic.go
+++ b/sonic.go
@@ -26,10 +26,19 @@ import (
 
     `github.com/bytedance/sonic/decoder`
     `github.com/bytedance/sonic/encoder`
+	enc `github.com/bytedance/sonic/internal/encoder`
+	dec `github.com/bytedance/sonic/internal/decoder/api`
+
     `github.com/bytedance/sonic/option`
     `github.com/bytedance/sonic/internal/rt`
 )
 
+func init() {
+	dec.ForceAllOpt()
+	enc.ForceUseVM()
+	println("Warning: enable all optimize here, only used in test now")
+}
+
 type frozenConfig struct {
     Config
     encoderOpts encoder.Options