diff --git a/src/JTTools/Pages/JT1078Pack.razor b/src/JTTools/Pages/JT1078Pack.razor
index 0f80263..4ac5db4 100644
--- a/src/JTTools/Pages/JT1078Pack.razor
+++ b/src/JTTools/Pages/JT1078Pack.razor
@@ -14,7 +14,7 @@
 @using System.ComponentModel.DataAnnotations;
 @using System.Text.Json;
 
-<Select DefaultValue="@MsgType" TItemValue="string" TItem="string" @bind-Value="@MsgType" Style="width:200px" OnSelectedItemChanged="OnSelectMsgType">
+<Select DefaultValue="@("0x9101")" TItemValue="string" TItem="string" @bind-Value="@MsgType" Style="width:200px" OnSelectedItemChanged="OnSelectMsgType">
     <SelectOptions>
         <SelectOption TItemValue="string" TItem="string" Value="@("0x9101")" Label="808_打开看视频" />
         <SelectOption TItemValue="string" TItem="string" Value="@("0x9102")" Label="808_关闭看视频"/>
diff --git a/src/JTTools/Pages/JT19056Analyze.razor b/src/JTTools/Pages/JT19056Analyze.razor
index 89bd917..e026004 100644
--- a/src/JTTools/Pages/JT19056Analyze.razor
+++ b/src/JTTools/Pages/JT19056Analyze.razor
@@ -6,7 +6,7 @@
 @inject IJT808Config  Config
 
 
-<Select @bind-Value="@wayType" TItemValue="string" TItem="string" Style="width:100px" OnSelectedItemChanged="@OnSelectWayType">
+<Select @bind-Value="@wayType" DefaultValue="@("up")" TItemValue="string" TItem="string" Style="width:100px" OnSelectedItemChanged="@OnSelectWayType">
     <SelectOptions>
         <SelectOption TItemValue="string" TItem="string" Value="@("up")"  Label="上行"/>
         <SelectOption TItemValue="string" TItem="string" Value="@("down")" Label="下行"/>
diff --git a/src/JTTools/Pages/JT808Analyze.razor b/src/JTTools/Pages/JT808Analyze.razor
index 8dc1fc9..4ef0c4c 100644
--- a/src/JTTools/Pages/JT808Analyze.razor
+++ b/src/JTTools/Pages/JT808Analyze.razor
@@ -15,7 +15,7 @@
 
 <Tag Color="blue">如有分包，请换行区分。</Tag>
 <br />
-<Select TItemValue="string" TItem="string" @bind-Value="@protocolType" Style="width:260px" OnSelectedItemChanged="OnSelectProtocolType">
+<Select TItemValue="string" TItem="string" DefaultValue="@("JT808")" @bind-Value="@protocolType" Style="width:260px" OnSelectedItemChanged="OnSelectProtocolType">
     <SelectOptions>
         <SelectOption TItemValue="string" TItem="string" Label="国标(通过包自动识别版本号)" Value="@("JT808")" />
         <SelectOption TItemValue="string" TItem="string" Label="国标扩展JT1078" Value="@("JT808_JT1078")" />
diff --git a/src/JTTools/Pages/JT809Analyze.razor b/src/JTTools/Pages/JT809Analyze.razor
index 79bc37c..e8b2571 100644
--- a/src/JTTools/Pages/JT809Analyze.razor
+++ b/src/JTTools/Pages/JT809Analyze.razor
@@ -13,14 +13,14 @@
 @inject JT809_2011_Config  Config2011
 @inject JT809_2019_Config  Config2019
 
-<Select @bind-Value="@version" TItemValue="string" TItem="string" Style="width:200px" OnSelectedItemChanged="OnSelectVersion">
+<Select @bind-Value="@version" DefaultValue="@("v2011")" TItemValue="string" TItem="string" Style="width:200px" OnSelectedItemChanged="OnSelectVersion">
     <SelectOptions>
         <SelectOption TItemValue="string" TItem="string" Value="@("v2011")" Label="2011版本"/>
         <SelectOption TItemValue="string" TItem="string" Value="@("v2019")" Label="2019版本"/>
     </SelectOptions>
 </Select>
 
-<Select TItemValue="string" TItem="string" @bind-Value="@encryptType" Style="width:200px" OnSelectedItemChanged="OnSelectEncryptType">
+<Select TItemValue="string" TItem="string" DefaultValue="@("none")" @bind-Value="@encryptType" Style="width:200px" OnSelectedItemChanged="OnSelectEncryptType">
     <SelectOptions>
         <SelectOption TItemValue="string" TItem="string" Value="@("none")" Label="未加密" />
         <SelectOption TItemValue="string" TItem="string" Value="@("encrypt")" Label="加密" />