diff --git a/server/Program.cs b/server/Program.cs
index 3116ce5..b3c015e 100644
--- a/server/Program.cs
+++ b/server/Program.cs
@@ -141,6 +141,11 @@ try
         options.OperationProcessors.Add(new OperationSecurityScopeProcessor("Bearer"));
     });
 
+    // 添加数据库资源管理器服务
+    builder.Services.AddScoped<Database.AppDataConnection>();
+    builder.Services.AddScoped<Database.UserManager>();
+    builder.Services.AddScoped<Database.ResourceManager>();
+    builder.Services.AddScoped<Database.ExamManager>();
 
     // 添加 HTTP 视频流服务
     builder.Services.AddSingleton<HttpVideoStreamService>();
@@ -152,11 +157,6 @@ try
     builder.Services.AddSingleton<ProgressTrackerService>();
     builder.Services.AddHostedService(provider => provider.GetRequiredService<ProgressTrackerService>());
 
-    // 添加数据库资源管理器服务
-    builder.Services.AddSingleton<Database.AppDataConnection>();
-    builder.Services.AddSingleton<Database.UserManager>();
-    builder.Services.AddSingleton<Database.ResourceManager>();
-
     // Application Settings
     var app = builder.Build();
     // Configure the HTTP request pipeline.
diff --git a/server/src/Services/HttpHdmiVideoStreamService.cs b/server/src/Services/HttpHdmiVideoStreamService.cs
index 1e762ee..56ac0d8 100644
--- a/server/src/Services/HttpHdmiVideoStreamService.cs
+++ b/server/src/Services/HttpHdmiVideoStreamService.cs
@@ -16,16 +16,16 @@ public class HttpHdmiVideoStreamService : BackgroundService
 {
     private readonly NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
 
-    private readonly Database.UserManager _userManager;
+    private readonly IServiceProvider _serviceProvider;
 
     private HttpListener? _httpListener;
     private readonly int _serverPort = 4322;
     private readonly ConcurrentDictionary<string, HdmiIn> _hdmiInDict = new();
     private readonly ConcurrentDictionary<string, CancellationTokenSource> _hdmiInCtsDict = new();
 
-    public HttpHdmiVideoStreamService(Database.UserManager userManager)
+    public HttpHdmiVideoStreamService(IServiceProvider serviceProvider)
     {
-        _userManager = userManager;
+        _serviceProvider = serviceProvider;
     }
 
     public override async Task StartAsync(CancellationToken cancellationToken)
@@ -141,7 +141,10 @@ public class HttpHdmiVideoStreamService : BackgroundService
             return hdmiIn;
         }
 
-        var boardRet = _userManager.GetBoardByID(Guid.Parse(boardId));
+        using var scope = _serviceProvider.CreateScope();
+        var userManager = scope.ServiceProvider.GetRequiredService<Database.UserManager>();
+
+        var boardRet = userManager.GetBoardByID(Guid.Parse(boardId));
         if (!boardRet.IsSuccessful || !boardRet.Value.HasValue)
         {
             logger.Error($"Failed to get board with ID {boardId}");
@@ -367,7 +370,10 @@ public class HttpHdmiVideoStreamService : BackgroundService
     /// <returns>返回所有可用的HDMI视频流终端点列表</returns>
     public List<HdmiVideoStreamEndpoint>? GetAllVideoEndpoints()
     {
-        var boards = _userManager.GetAllBoard();
+        using var scope = _serviceProvider.CreateScope();
+        var userManager = scope.ServiceProvider.GetRequiredService<Database.UserManager>();
+
+        var boards = userManager.GetAllBoard();
         if (boards == null)
             return null;
 
diff --git a/server/src/Services/HttpVideoStreamService.cs b/server/src/Services/HttpVideoStreamService.cs
index a237bf5..2a14caf 100644
--- a/server/src/Services/HttpVideoStreamService.cs
+++ b/server/src/Services/HttpVideoStreamService.cs
@@ -95,7 +95,7 @@ public class HttpVideoStreamService : BackgroundService
 {
     private static readonly NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
 
-    private readonly Database.UserManager _userManager;
+    private readonly IServiceProvider _serviceProvider;
 
     private HttpListener? _httpListener;
     private readonly int _serverPort = 4321;
@@ -109,12 +109,11 @@ public class HttpVideoStreamService : BackgroundService
     private readonly object _usbCameraLock = new object();
 #endif
 
-    public HttpVideoStreamService(Database.UserManager userManager)
+    public HttpVideoStreamService(IServiceProvider serviceProvider)
     {
-        _userManager = userManager;
+        _serviceProvider = serviceProvider;
     }
 
-
     private Optional<VideoStreamClient> TryGetClient(string boardId)
     {
         if (_clientDict.TryGetValue(boardId, out var client))
@@ -132,7 +131,10 @@ public class HttpVideoStreamService : BackgroundService
             return client;
         }
 
-        var boardRet = _userManager.GetBoardByID(Guid.Parse(boardId));
+        using var scope = _serviceProvider.CreateScope();
+        var userManager = scope.ServiceProvider.GetRequiredService<Database.UserManager>();
+
+        var boardRet = userManager.GetBoardByID(Guid.Parse(boardId));
         if (!boardRet.IsSuccessful || !boardRet.Value.HasValue)
         {
             logger.Error($"Failed to get board with ID {boardId}");