diff --git a/pkg/ingress/kube/configmap/global.go b/pkg/ingress/kube/configmap/global.go
index 29221b42e..95a456a6e 100644
--- a/pkg/ingress/kube/configmap/global.go
+++ b/pkg/ingress/kube/configmap/global.go
@@ -15,7 +15,6 @@
 package configmap
 
 import (
-	"encoding/json"
 	"fmt"
 	"reflect"
 	"sync/atomic"
@@ -58,7 +57,7 @@ type Global struct {
 // Downstream configures the behavior of the downstream connection.
 type Downstream struct {
 	// IdleTimeout limits the time that a connection may be idle and stream idle.
-	IdleTimeout uint32 `json:"idleTimeout,omitempty"`
+	IdleTimeout uint32 `json:"idleTimeout"`
 	// MaxRequestHeadersKb limits the size of request headers allowed.
 	MaxRequestHeadersKb uint32 `json:"maxRequestHeadersKb,omitempty"`
 	// ConnectionBufferLimits configures the buffer size limits for connections.
@@ -139,12 +138,19 @@ func compareGlobal(old *Global, new *Global) (Result, error) {
 // deepCopyGlobal deep copies the global option.
 func deepCopyGlobal(global *Global) (*Global, error) {
 	newGlobal := NewDefaultGlobalOption()
-	bytes, err := json.Marshal(global)
-	if err != nil {
-		return nil, err
+	if global.Downstream != nil {
+		newGlobal.Downstream.IdleTimeout = global.Downstream.IdleTimeout
+		newGlobal.Downstream.MaxRequestHeadersKb = global.Downstream.MaxRequestHeadersKb
+		newGlobal.Downstream.ConnectionBufferLimits = global.Downstream.ConnectionBufferLimits
+		if global.Downstream.Http2 != nil {
+			newGlobal.Downstream.Http2.MaxConcurrentStreams = global.Downstream.Http2.MaxConcurrentStreams
+			newGlobal.Downstream.Http2.InitialStreamWindowSize = global.Downstream.Http2.InitialStreamWindowSize
+			newGlobal.Downstream.Http2.InitialConnectionWindowSize = global.Downstream.Http2.InitialConnectionWindowSize
+		}
 	}
-	err = json.Unmarshal(bytes, newGlobal)
-	return newGlobal, err
+	newGlobal.AddXRealIpHeader = global.AddXRealIpHeader
+	newGlobal.DisableXEnvoyHeaders = global.DisableXEnvoyHeaders
+	return newGlobal, nil
 }
 
 // NewDefaultGlobalOption returns a default global config.
diff --git a/pkg/ingress/kube/configmap/global_test.go b/pkg/ingress/kube/configmap/global_test.go
index b2f0cd9ce..0f08ad9d1 100644
--- a/pkg/ingress/kube/configmap/global_test.go
+++ b/pkg/ingress/kube/configmap/global_test.go
@@ -131,7 +131,7 @@ func Test_deepCopyGlobal(t *testing.T) {
 			name: "deep copy 2",
 			global: &Global{
 				Downstream: &Downstream{
-					IdleTimeout:            1,
+					IdleTimeout:            0,
 					MaxRequestHeadersKb:    9600,
 					ConnectionBufferLimits: 4096,
 					Http2:                  NewDefaultHttp2(),
@@ -141,7 +141,7 @@ func Test_deepCopyGlobal(t *testing.T) {
 			},
 			want: &Global{
 				Downstream: &Downstream{
-					IdleTimeout:            1,
+					IdleTimeout:            0,
 					MaxRequestHeadersKb:    9600,
 					ConnectionBufferLimits: 4096,
 					Http2:                  NewDefaultHttp2(),
@@ -151,20 +151,6 @@ func Test_deepCopyGlobal(t *testing.T) {
 			},
 			wantErr: nil,
 		},
-		{
-			name: "deep copy 3",
-			global: &Global{
-				Downstream:           &Downstream{},
-				AddXRealIpHeader:     true,
-				DisableXEnvoyHeaders: true,
-			},
-			want: &Global{
-				Downstream:           NewDefaultDownstream(),
-				AddXRealIpHeader:     true,
-				DisableXEnvoyHeaders: true,
-			},
-			wantErr: nil,
-		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -203,7 +189,10 @@ func Test_AddOrUpdateHigressConfig(t *testing.T) {
 			old:  NewDefaultHigressConfig(),
 			new: &HigressConfig{
 				Downstream: &Downstream{
-					IdleTimeout: 1,
+					IdleTimeout:            1,
+					MaxRequestHeadersKb:    defaultMaxRequestHeadersKb,
+					ConnectionBufferLimits: defaultConnectionBufferLimits,
+					Http2:                  NewDefaultHttp2(),
 				},
 				AddXRealIpHeader:     true,
 				DisableXEnvoyHeaders: true,
diff --git a/test/e2e/conformance/tests/configmap-global.go b/test/e2e/conformance/tests/configmap-global.go
index c1eef1ecd..2a149403e 100644
--- a/test/e2e/conformance/tests/configmap-global.go
+++ b/test/e2e/conformance/tests/configmap-global.go
@@ -543,6 +543,83 @@ var ConfigMapGlobalEnvoy = suite.ConformanceTest{
 					},
 				},
 			},
+			{
+				name: "close the setting of idle timeout",
+				higressConfig: &configmap.HigressConfig{
+					Downstream: &configmap.Downstream{
+						IdleTimeout:            0,
+						MaxRequestHeadersKb:    60,
+						ConnectionBufferLimits: 32768,
+						Http2: &configmap.Http2{
+							MaxConcurrentStreams:        100,
+							InitialStreamWindowSize:     65535,
+							InitialConnectionWindowSize: 1048576,
+						},
+					},
+					DisableXEnvoyHeaders: true,
+					AddXRealIpHeader:     true,
+				},
+				envoyAssertion: []envoy.Assertion{
+					{
+						Path:            "configs.#.dynamic_route_configs.#.route_config",
+						CheckType:       envoy.CheckTypeExist,
+						TargetNamespace: "higress-system",
+						ExpectEnvoyConfig: map[string]interface{}{
+							"request_headers_to_add": []interface{}{
+								map[string]interface{}{
+									"append": false,
+									"header": map[string]interface{}{
+										"key":   "x-real-ip",
+										"value": "%REQ(X-ENVOY-EXTERNAL-ADDRESS)%",
+									},
+								},
+							},
+						},
+					},
+					{
+						Path:            "configs.#.dynamic_listeners.#.active_state.listener.filter_chains.#.filters.#.typed_config",
+						CheckType:       envoy.CheckTypeExist,
+						TargetNamespace: "higress-system",
+						ExpectEnvoyConfig: map[string]interface{}{
+							"@type":       "type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager",
+							"stat_prefix": "outbound_0.0.0.0_80",
+						},
+					},
+					{
+						Path:            "configs.#.dynamic_listeners.#.active_state.listener.filter_chains.#.filters.#.typed_config.http_filters",
+						CheckType:       envoy.CheckTypeMatch,
+						TargetNamespace: "higress-system",
+						ExpectEnvoyConfig: map[string]interface{}{
+							"name": "envoy.filters.http.router",
+							"typed_config": map[string]interface{}{
+								"@type":                  "type.googleapis.com/envoy.extensions.filters.http.router.v3.Router",
+								"suppress_envoy_headers": true,
+							},
+						},
+					},
+					{
+						Path:            "configs.#.dynamic_listeners.#.active_state.listener",
+						CheckType:       envoy.CheckTypeExist,
+						TargetNamespace: "higress-system",
+						ExpectEnvoyConfig: map[string]interface{}{
+							"per_connection_buffer_limit_bytes": 32768,
+						},
+					},
+					{
+						Path:            "configs.#.dynamic_listeners.#.active_state.listener.filter_chains.#.filters.#.typed_config",
+						CheckType:       envoy.CheckTypeExist,
+						TargetNamespace: "higress-system",
+						ExpectEnvoyConfig: map[string]interface{}{
+							"max_concurrent_streams":         100,
+							"initial_stream_window_size":     65535,
+							"initial_connection_window_size": 1048576,
+							"stream_idle_timeout":            "0s",
+							"max_request_headers_kb":         60,
+							"idle_timeout":                   "0s",
+						},
+					},
+				},
+			},
 		}
 
 		t.Run("ConfigMap Global Envoy", func(t *testing.T) {