diff --git a/web/assets/js/model/inbound.js b/web/assets/js/model/inbound.js
index 4eeb1964..b196a06d 100644
--- a/web/assets/js/model/inbound.js
+++ b/web/assets/js/model/inbound.js
@@ -323,7 +323,7 @@ class KcpStreamSettings extends XrayCommonClass {
         tti = 20,
         uplinkCapacity = 5,
         downlinkCapacity = 20,
-        cwndMultiplier = 0,
+        cwndMultiplier = 1,
         maxSendingWindow = 0,
     ) {
         super();
diff --git a/web/assets/js/model/outbound.js b/web/assets/js/model/outbound.js
index 9a26a954..9b09ae7c 100644
--- a/web/assets/js/model/outbound.js
+++ b/web/assets/js/model/outbound.js
@@ -169,7 +169,7 @@ class KcpStreamSettings extends CommonClass {
         tti = 20,
         uplinkCapacity = 5,
         downlinkCapacity = 20,
-        cwndMultiplier = 0,
+        cwndMultiplier = 1,
         maxSendingWindow = 0,
     ) {
         super();
diff --git a/web/html/form/outbound.html b/web/html/form/outbound.html
index 7bac266f..a9119cf0 100644
--- a/web/html/form/outbound.html
+++ b/web/html/form/outbound.html
@@ -587,7 +587,7 @@
           <a-form-item label="CWND Multiplier">
             <a-input-number
               v-model.number="outbound.stream.kcp.cwndMultiplier"
-              min="0"
+              min="1"
             ></a-input-number>
           </a-form-item>
           <a-form-item label="Max Sending Window">
diff --git a/web/html/form/stream/stream_kcp.html b/web/html/form/stream/stream_kcp.html
index a07b843f..e8fea76d 100644
--- a/web/html/form/stream/stream_kcp.html
+++ b/web/html/form/stream/stream_kcp.html
@@ -33,7 +33,7 @@
   <a-form-item label="CWND Multiplier">
     <a-input-number
       v-model.number="inbound.stream.kcp.cwndMultiplier"
-      :min="0"
+      :min="1"
     ></a-input-number>
   </a-form-item>
   <a-form-item label="Max Sending Window">