diff --git a/src/JT808.DotNetty.Test/JT808DefaultChannelId.cs b/src/JT808.DotNetty.Test/JT808DefaultChannelId.cs
new file mode 100644
index 0000000..be2c1bd
--- /dev/null
+++ b/src/JT808.DotNetty.Test/JT808DefaultChannelId.cs
@@ -0,0 +1,28 @@
+using DotNetty.Transport.Channels;
+using JT808.DotNetty.Metadata;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace JT808.DotNetty.Test
+{
+    public class JT808DefaultChannelId : IChannelId
+    {
+        private static readonly JT808AtomicCounter jT808AtomicCounter = new JT808AtomicCounter();
+
+        public string AsLongText()
+        {
+            return jT808AtomicCounter.Increment().ToString();
+        }
+
+        public string AsShortText()
+        {
+            return jT808AtomicCounter.Increment().ToString();
+        }
+
+        public int CompareTo(IChannelId other)
+        {
+            return  0;
+        }
+    }
+}
diff --git a/src/JT808.DotNetty.Test/JT808SessionManagerTest.cs b/src/JT808.DotNetty.Test/JT808SessionManagerTest.cs
index 04a1e66..4eba9a1 100644
--- a/src/JT808.DotNetty.Test/JT808SessionManagerTest.cs
+++ b/src/JT808.DotNetty.Test/JT808SessionManagerTest.cs
@@ -11,18 +11,95 @@ namespace JT808.DotNetty.Test
     {
         JT808SessionManager jT808SessionManager = new JT808SessionManager(new LoggerFactory());
 
-       [Fact]
+        string TerminalPhoneNo = "123456789123";
+
+        [Fact]
         public void Test1()
         {
             var channel = new EmbeddedChannel();
-            jT808SessionManager.TryAddOrUpdateSession(new Metadata.JT808Session(channel, "123456789123"));
+            jT808SessionManager.TryAddOrUpdateSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
         }
 
         [Fact]
         public void Test2()
         {
             var channel = new EmbeddedChannel();
-            jT808SessionManager.TryAddSession(new Metadata.JT808Session(channel, "123456789123"));
+            jT808SessionManager.TryAddSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+        }
+
+        [Fact]
+        public void Test3()
+        {
+            var channel = new EmbeddedChannel();
+            jT808SessionManager.TryAddSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            jT808SessionManager.TryAddOrUpdateSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            var sessionInfo=jT808SessionManager.GetSessionByTerminalPhoneNo(TerminalPhoneNo);
+            Assert.Equal(TerminalPhoneNo, sessionInfo.TerminalPhoneNo);
+            Assert.Equal("embedded", sessionInfo.SessionID);
+        }
+
+        [Fact]
+        public void Test4()
+        {
+            var channel = new EmbeddedChannel();
+            jT808SessionManager.TryAddSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            jT808SessionManager.TryAddOrUpdateSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            jT808SessionManager.Heartbeat(TerminalPhoneNo);
+        }
+
+        [Fact]
+        public void Test5()
+        {
+            var channel = new EmbeddedChannel();
+            jT808SessionManager.TryAddSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            jT808SessionManager.TryAddOrUpdateSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            var sessionInfo = jT808SessionManager.GetSessionByID("embedded");
+            Assert.Equal(TerminalPhoneNo, sessionInfo.TerminalPhoneNo);
+            Assert.Equal("embedded", sessionInfo.SessionID);
+        }
+
+
+        [Fact]
+        public void Test6()
+        {
+            var channel = new EmbeddedChannel();
+            jT808SessionManager.TryAddSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            jT808SessionManager.TryAddOrUpdateSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            var sessionInfo = jT808SessionManager.RemoveSessionByID("embedded");
+            Assert.Equal(TerminalPhoneNo, sessionInfo.TerminalPhoneNo);
+            Assert.Equal("embedded", sessionInfo.SessionID);
+        }
+
+
+        [Fact]
+        public void Test7()
+        {
+            var channel = new EmbeddedChannel();
+            jT808SessionManager.TryAddSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            jT808SessionManager.TryAddOrUpdateSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            var sessionInfo = jT808SessionManager.RemoveSessionByTerminalPhoneNo(TerminalPhoneNo);
+            Assert.Equal(TerminalPhoneNo, sessionInfo.TerminalPhoneNo);
+            Assert.Equal("embedded", sessionInfo.SessionID);
+        }
+
+        [Fact]
+        public void Test8()
+        {
+            var channel = new EmbeddedChannel();
+            jT808SessionManager.TryAddSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            jT808SessionManager.TryAddOrUpdateSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            var realSessionInfos = jT808SessionManager.GetRealAll();
+            var relevanceSessionInfos = jT808SessionManager.GetRelevanceAll();
+        }
+
+        [Fact]
+        public void Test9()
+        {
+            var channel = new EmbeddedChannel();
+            jT808SessionManager.TryAddSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            jT808SessionManager.TryAddOrUpdateSession(new Metadata.JT808Session(channel, TerminalPhoneNo));
+            var realSessionCount = jT808SessionManager.RealSessionCount;
+            var relevanceSessionCount = jT808SessionManager.RealSessionCount;
         }
     }
 }
diff --git a/src/JT808.DotNetty.Test/SeedSession.cs b/src/JT808.DotNetty.Test/SeedSession.cs
new file mode 100644
index 0000000..9acbb98
--- /dev/null
+++ b/src/JT808.DotNetty.Test/SeedSession.cs
@@ -0,0 +1,22 @@
+using DotNetty.Transport.Channels.Embedded;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+
+namespace JT808.DotNetty.Test
+{
+    public class SeedSession
+    {
+        public  List<EmbeddedChannel> embeddedChannels = new List<EmbeddedChannel>();
+
+        [Fact]
+        public void Init()
+        {
+            for(var i = 0; i < 10; i++)
+            {
+                embeddedChannels.Add(new EmbeddedChannel(new JT808DefaultChannelId()));
+            }
+        }
+    }
+}
diff --git a/src/JT808.DotNetty/JT808SessionManager.cs b/src/JT808.DotNetty/JT808SessionManager.cs
index eb829d9..cb0e6cd 100644
--- a/src/JT808.DotNetty/JT808SessionManager.cs
+++ b/src/JT808.DotNetty/JT808SessionManager.cs
@@ -189,9 +189,9 @@ namespace JT808.DotNetty
             return SessionIdDict.Select(s=>s.Value);
         }
 
-        public List<JT808Session> GetRelevanceAll()
+        public IEnumerable<JT808Session> GetRelevanceAll()
         {
-            return SessionIdDict.Join(TerminalPhoneNo_SessionId_Dict, m => m.Key, s => s.Value, (m, s) => m.Value).ToList();
+            return SessionIdDict.Join(TerminalPhoneNo_SessionId_Dict, m => m.Key, s => s.Value, (m, s) => m.Value);
         }
       
     }