diff --git a/internal/waf/checkpoints/request_all.go b/internal/waf/checkpoints/request_all.go
index fc76b97..b347568 100644
--- a/internal/waf/checkpoints/request_all.go
+++ b/internal/waf/checkpoints/request_all.go
@@ -2,6 +2,7 @@ package checkpoints
 
 import (
 	"github.com/TeaOSLab/EdgeNode/internal/waf/requests"
+	"github.com/TeaOSLab/EdgeNode/internal/waf/utils"
 	"github.com/iwind/TeaGo/maps"
 )
 
@@ -28,7 +29,7 @@ func (this *RequestAllCheckpoint) RequestValue(req requests.Request, param strin
 
 		var bodyData = req.WAFGetCacheBody()
 		if len(bodyData) == 0 {
-			data, err := req.WAFReadBody(int64(32 * 1024 * 1024)) // read 32m bytes
+			data, err := req.WAFReadBody(utils.MaxBodySize) // read body
 			if err != nil {
 				return "", err, nil
 			}
diff --git a/internal/waf/checkpoints/request_body.go b/internal/waf/checkpoints/request_body.go
index ce00565..90884d6 100644
--- a/internal/waf/checkpoints/request_body.go
+++ b/internal/waf/checkpoints/request_body.go
@@ -2,6 +2,7 @@ package checkpoints
 
 import (
 	"github.com/TeaOSLab/EdgeNode/internal/waf/requests"
+	"github.com/TeaOSLab/EdgeNode/internal/waf/utils"
 	"github.com/iwind/TeaGo/maps"
 )
 
@@ -23,7 +24,7 @@ func (this *RequestBodyCheckpoint) RequestValue(req requests.Request, param stri
 
 	var bodyData = req.WAFGetCacheBody()
 	if len(bodyData) == 0 {
-		data, err := req.WAFReadBody(int64(32 * 1024 * 1024)) // read 32m bytes
+		data, err := req.WAFReadBody(utils.MaxBodySize) // read body
 		if err != nil {
 			return "", err, nil
 		}
diff --git a/internal/waf/checkpoints/request_form_arg.go b/internal/waf/checkpoints/request_form_arg.go
index 9ebc929..8cc3a37 100644
--- a/internal/waf/checkpoints/request_form_arg.go
+++ b/internal/waf/checkpoints/request_form_arg.go
@@ -2,6 +2,7 @@ package checkpoints
 
 import (
 	"github.com/TeaOSLab/EdgeNode/internal/waf/requests"
+	"github.com/TeaOSLab/EdgeNode/internal/waf/utils"
 	"github.com/iwind/TeaGo/maps"
 	"net/url"
 )
@@ -24,7 +25,7 @@ func (this *RequestFormArgCheckpoint) RequestValue(req requests.Request, param s
 
 	var bodyData = req.WAFGetCacheBody()
 	if len(bodyData) == 0 {
-		data, err := req.WAFReadBody(int64(32 * 1024 * 1024)) // read 32m bytes
+		data, err := req.WAFReadBody(utils.MaxBodySize) // read body
 		if err != nil {
 			return "", err, nil
 		}
diff --git a/internal/waf/checkpoints/request_json_arg.go b/internal/waf/checkpoints/request_json_arg.go
index 341db2d..578ab18 100644
--- a/internal/waf/checkpoints/request_json_arg.go
+++ b/internal/waf/checkpoints/request_json_arg.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"github.com/TeaOSLab/EdgeNode/internal/utils"
 	"github.com/TeaOSLab/EdgeNode/internal/waf/requests"
+	wafutils "github.com/TeaOSLab/EdgeNode/internal/waf/utils"
 	"github.com/iwind/TeaGo/maps"
 	"strings"
 )
@@ -16,7 +17,7 @@ type RequestJSONArgCheckpoint struct {
 func (this *RequestJSONArgCheckpoint) RequestValue(req requests.Request, param string, options maps.Map) (value interface{}, sysErr error, userErr error) {
 	var bodyData = req.WAFGetCacheBody()
 	if len(bodyData) == 0 {
-		data, err := req.WAFReadBody(int64(32 * 1024 * 1024)) // read 32m bytes
+		data, err := req.WAFReadBody(wafutils.MaxBodySize) // read body
 		if err != nil {
 			return "", err, nil
 		}
diff --git a/internal/waf/checkpoints/request_upload.go b/internal/waf/checkpoints/request_upload.go
index 9608f0e..474bb81 100644
--- a/internal/waf/checkpoints/request_upload.go
+++ b/internal/waf/checkpoints/request_upload.go
@@ -3,6 +3,7 @@ package checkpoints
 import (
 	"bytes"
 	"github.com/TeaOSLab/EdgeNode/internal/waf/requests"
+	"github.com/TeaOSLab/EdgeNode/internal/waf/utils"
 	"github.com/iwind/TeaGo/lists"
 	"github.com/iwind/TeaGo/maps"
 	"io/ioutil"
@@ -38,7 +39,7 @@ func (this *RequestUploadCheckpoint) RequestValue(req requests.Request, param st
 	if req.WAFRaw().MultipartForm == nil {
 		var bodyData = req.WAFGetCacheBody()
 		if len(bodyData) == 0 {
-			data, err := req.WAFReadBody(32 * 1024 * 1024)
+			data, err := req.WAFReadBody(utils.MaxBodySize)
 			if err != nil {
 				sysErr = err
 				return
@@ -51,7 +52,7 @@ func (this *RequestUploadCheckpoint) RequestValue(req requests.Request, param st
 		oldBody := req.WAFRaw().Body
 		req.WAFRaw().Body = ioutil.NopCloser(bytes.NewBuffer(bodyData))
 
-		err := req.WAFRaw().ParseMultipartForm(32 * 1024 * 1024)
+		err := req.WAFRaw().ParseMultipartForm(utils.MaxBodySize)
 
 		// 还原
 		req.WAFRaw().Body = oldBody
diff --git a/internal/waf/utils/consts.go b/internal/waf/utils/consts.go
new file mode 100644
index 0000000..a291048
--- /dev/null
+++ b/internal/waf/utils/consts.go
@@ -0,0 +1,9 @@
+// Copyright 2022 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package utils
+
+import "github.com/TeaOSLab/EdgeNode/internal/utils/sizes"
+
+const (
+	MaxBodySize = 4 * sizes.M
+)