diff --git a/DownKyi.Core/Storage/Database/DbHelper.cs b/DownKyi.Core/Storage/Database/DbHelper.cs
index 8b6db35..e4e46fc 100644
--- a/DownKyi.Core/Storage/Database/DbHelper.cs
+++ b/DownKyi.Core/Storage/Database/DbHelper.cs
@@ -1,20 +1,37 @@
-using System;
+using DownKyi.Core.Logging;
+using System;
+using System.Collections.Generic;
 using System.Data.SQLite;
 
 namespace DownKyi.Core.Storage.Database
 {
     public class DbHelper
     {
+        private readonly string connStr;
         private readonly SQLiteConnection conn;
 
+        private static readonly Dictionary<string, SQLiteConnection> database = new Dictionary<string, SQLiteConnection>();
+
         /// <summary>
         /// 创建一个数据库
         /// </summary>
         /// <param name="dbPath"></param>
         public DbHelper(string dbPath)
         {
-            string connStr = $"Data Source={dbPath};Version=3;";
+            connStr = $"Data Source={dbPath};Version=3;";
+
+            if (database.ContainsKey(connStr))
+            {
+                conn = database[connStr];
+
+                if (conn != null)
+                {
+                    return;
+                }
+            }
+
             conn = new SQLiteConnection(connStr);
+            database.Add(connStr, conn);
         }
 
         /// <summary>
@@ -25,8 +42,20 @@ namespace DownKyi.Core.Storage.Database
         public DbHelper(string dbPath, string secretKey)
         {
             string connStr = $"Data Source={dbPath};Version=3;";
+
+            if (database.ContainsKey(connStr))
+            {
+                conn = database[connStr];
+
+                if (conn != null)
+                {
+                    return;
+                }
+            }
+
             conn = new SQLiteConnection(connStr);
             conn.SetPassword(secretKey);
+            database.Add(connStr, conn);
         }
 
         /// <summary>
@@ -57,6 +86,8 @@ namespace DownKyi.Core.Storage.Database
             if (IsOpen())
             {
                 conn.Close();
+
+                database.Remove(connStr);
             }
         }
 
@@ -66,21 +97,29 @@ namespace DownKyi.Core.Storage.Database
         /// <param name="sql"></param>
         public void ExecuteNonQuery(string sql, Action<SQLiteParameterCollection> action = null)
         {
-            lock (conn)
+            try
             {
-                Open();
-                using (var tr = conn.BeginTransaction())
+                lock (conn)
                 {
-                    using (var command = conn.CreateCommand())
+                    Open();
+                    using (var tr = conn.BeginTransaction())
                     {
-                        command.CommandText = sql;
-                        // 添加参数
-                        action?.Invoke(command.Parameters);
-                        command.ExecuteNonQuery();
+                        using (var command = conn.CreateCommand())
+                        {
+                            command.CommandText = sql;
+                            // 添加参数
+                            action?.Invoke(command.Parameters);
+                            command.ExecuteNonQuery();
+                        }
+                        tr.Commit();
                     }
-                    tr.Commit();
                 }
             }
+            catch (SQLiteException e)
+            {
+                Utils.Debugging.Console.PrintLine("DbHelper ExecuteNonQuery()发生异常: {0}", e);
+                LogManager.Error("DbHelper ExecuteNonQuery()", e);
+            }
         }
 
         /// <summary>
@@ -90,16 +129,24 @@ namespace DownKyi.Core.Storage.Database
         /// <param name="action"></param>
         public void ExecuteQuery(string sql, Action<SQLiteDataReader> action)
         {
-            lock (conn)
+            try
             {
-                Open();
-                using (var command = conn.CreateCommand())
+                lock (conn)
                 {
-                    command.CommandText = sql;
-                    var reader = command.ExecuteReader();
-                    action(reader);
+                    Open();
+                    using (var command = conn.CreateCommand())
+                    {
+                        command.CommandText = sql;
+                        var reader = command.ExecuteReader();
+                        action(reader);
+                    }
                 }
             }
+            catch (SQLiteException e)
+            {
+                Utils.Debugging.Console.PrintLine("DbHelper ExecuteQuery()发生异常: {0}", e);
+                LogManager.Error("DbHelper ExecuteQuery()", e);
+            }
         }
 
     }
diff --git a/DownKyi/Services/Download/DownloadStorageService.cs b/DownKyi/Services/Download/DownloadStorageService.cs
index d0bab9e..92df1e4 100644
--- a/DownKyi/Services/Download/DownloadStorageService.cs
+++ b/DownKyi/Services/Download/DownloadStorageService.cs
@@ -7,6 +7,16 @@ namespace DownKyi.Services.Download
 {
     public class DownloadStorageService
     {
+        ~DownloadStorageService()
+        {
+            DownloadingDb downloadingDb = new DownloadingDb();
+            downloadingDb.Close();
+            DownloadedDb downloadedDb = new DownloadedDb();
+            downloadedDb.Close();
+            DownloadBaseDb downloadBaseDb = new DownloadBaseDb();
+            downloadBaseDb.Close();
+        }
+
         #region 下载中数据
 
         /// <summary>
@@ -25,7 +35,7 @@ namespace DownKyi.Services.Download
             {
                 downloadingDb.Insert(downloadingItem.DownloadBase.Uuid, downloadingItem.Downloading);
             }
-            downloadingDb.Close();
+            //downloadingDb.Close();
         }
 
         /// <summary>
@@ -40,7 +50,7 @@ namespace DownKyi.Services.Download
 
             DownloadingDb downloadingDb = new DownloadingDb();
             downloadingDb.Delete(downloadingItem.DownloadBase.Uuid);
-            downloadingDb.Close();
+            //downloadingDb.Close();
         }
 
         /// <summary>
@@ -52,7 +62,7 @@ namespace DownKyi.Services.Download
             // 从数据库获取数据
             DownloadingDb downloadingDb = new DownloadingDb();
             Dictionary<string, object> dic = downloadingDb.QueryAll();
-            downloadingDb.Close();
+            //downloadingDb.Close();
 
             // 遍历
             List<DownloadingItem> list = new List<DownloadingItem>();
@@ -85,7 +95,7 @@ namespace DownKyi.Services.Download
 
             DownloadingDb downloadingDb = new DownloadingDb();
             downloadingDb.Update(downloadingItem.DownloadBase.Uuid, downloadingItem.Downloading);
-            downloadingDb.Close();
+            //downloadingDb.Close();
         }
 
         #endregion
@@ -108,7 +118,7 @@ namespace DownKyi.Services.Download
             {
                 downloadedDb.Insert(downloadedItem.DownloadBase.Uuid, downloadedItem.Downloaded);
             }
-            downloadedDb.Close();
+            //downloadedDb.Close();
         }
 
         /// <summary>
@@ -123,7 +133,7 @@ namespace DownKyi.Services.Download
 
             DownloadedDb downloadedDb = new DownloadedDb();
             downloadedDb.Delete(downloadedItem.DownloadBase.Uuid);
-            downloadedDb.Close();
+            //downloadedDb.Close();
         }
 
         /// <summary>
@@ -135,7 +145,7 @@ namespace DownKyi.Services.Download
             // 从数据库获取数据
             DownloadedDb downloadedDb = new DownloadedDb();
             Dictionary<string, object> dic = downloadedDb.QueryAll();
-            downloadedDb.Close();
+            //downloadedDb.Close();
 
             // 遍历
             List<DownloadedItem> list = new List<DownloadedItem>();
@@ -168,7 +178,7 @@ namespace DownKyi.Services.Download
 
             DownloadedDb downloadedDb = new DownloadedDb();
             downloadedDb.Update(downloadedItem.DownloadBase.Uuid, downloadedItem.Downloaded);
-            downloadedDb.Close();
+            //downloadedDb.Close();
         }
 
         #endregion
@@ -189,7 +199,7 @@ namespace DownKyi.Services.Download
             {
                 downloadBaseDb.Insert(downloadBase.Uuid, downloadBase);
             }
-            downloadBaseDb.Close();
+            //downloadBaseDb.Close();
         }
 
         /// <summary>
@@ -200,7 +210,7 @@ namespace DownKyi.Services.Download
         {
             DownloadBaseDb downloadBaseDb = new DownloadBaseDb();
             downloadBaseDb.Delete(uuid);
-            downloadBaseDb.Close();
+            //downloadBaseDb.Close();
         }
 
         /// <summary>
@@ -211,7 +221,7 @@ namespace DownKyi.Services.Download
         {
             DownloadBaseDb downloadBaseDb = new DownloadBaseDb();
             object obj = downloadBaseDb.QueryById(uuid);
-            downloadBaseDb.Close();
+            //downloadBaseDb.Close();
 
             return obj is DownloadBase downloadBase ? downloadBase : null;
         }
@@ -226,7 +236,7 @@ namespace DownKyi.Services.Download
 
             DownloadBaseDb downloadBaseDb = new DownloadBaseDb();
             downloadBaseDb.Update(downloadBase.Uuid, downloadBase);
-            downloadBaseDb.Close();
+            //downloadBaseDb.Close();
         }
 
         #endregion