diff --git a/orm/src/main/java/com/zfoo/orm/lpmap/FileHeapMap.java b/orm/src/main/java/com/zfoo/orm/lpmap/FileHeapMap.java
new file mode 100644
index 00000000..7ddbae16
--- /dev/null
+++ b/orm/src/main/java/com/zfoo/orm/lpmap/FileHeapMap.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2020 The zfoo Authors
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and limitations under the License.
+ */
+
+package com.zfoo.orm.lpmap;
+
+import com.zfoo.protocol.IPacket;
+import com.zfoo.protocol.ProtocolManager;
+import com.zfoo.protocol.buffer.ByteBufUtils;
+import com.zfoo.protocol.registration.IProtocolRegistration;
+import com.zfoo.protocol.registration.ProtocolAnalysis;
+import com.zfoo.protocol.util.FileUtils;
+import com.zfoo.protocol.util.IOUtils;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.util.ReferenceCountUtil;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.channels.FileChannel;
+
+/**
+ * @author jaysunxiao
+ * @version 3.0
+ */
+public class FileHeapMap<V extends IPacket> implements LpMap<V> {
+
+    private File file;
+
+    private IProtocolRegistration protocolRegistration;
+
+    private HeapMap<V> heapMap;
+
+    public FileHeapMap(File file, int initialCapacity, Class<V> clazz) {
+        this.file = file;
+        var protocolId = ProtocolAnalysis.getProtocolIdByClass(clazz);
+        protocolRegistration = ProtocolManager.getProtocol(protocolId);
+        heapMap = new HeapMap<>(initialCapacity);
+
+        load();
+    }
+
+
+    @Override
+    public long insert(V packet) {
+        return heapMap.insert(packet);
+    }
+
+    @Override
+    public V put(long key, V packet) {
+        return heapMap.put(key, packet);
+    }
+
+    @Override
+    public V delete(long key) {
+        return heapMap.delete(key);
+    }
+
+    @Override
+    public V get(long key) {
+        return heapMap.get(key);
+    }
+
+    private void load() {
+        FileInputStream fileInputStream = null;
+        FileChannel fileChannel = null;
+        ByteBuf buffer = null;
+        try {
+            fileInputStream = FileUtils.openInputStream(file);
+            fileChannel = fileInputStream.getChannel();
+
+            buffer = ByteBufAllocator.DEFAULT.ioBuffer(1000);
+            buffer.writeBytes(fileChannel, 0L, (int) file.length());
+
+            var size = ByteBufUtils.readLong(buffer);
+            for (int i = 0; i < size; i++) {
+                var key = ByteBufUtils.readLong(buffer);
+                var value = (V) protocolRegistration.read(buffer);
+                put(key, value);
+            }
+        } catch (IOException e) {
+            IOUtils.closeIO(fileChannel, fileInputStream);
+            ReferenceCountUtil.release(buffer);
+        }
+    }
+
+    public void save() {
+        FileOutputStream fileOutputStream = null;
+        ByteBuf buffer = null;
+        try {
+            fileOutputStream = FileUtils.openOutputStream(file, false);
+            buffer = ByteBufAllocator.DEFAULT.heapBuffer(1000);
+
+            // 写入长度
+            ByteBufUtils.writeLong(buffer, heapMap.map.size());
+            buffer.readBytes(fileOutputStream, buffer.readableBytes());
+
+            for (var entry : heapMap.map.entries()) {
+                buffer.clear();
+
+                var key = entry.key();
+                var value = entry.value();
+                ByteBufUtils.writeLong(buffer, key);
+                protocolRegistration.write(buffer, value);
+
+                buffer.readBytes(fileOutputStream, buffer.readableBytes());
+            }
+        } catch (IOException e) {
+            IOUtils.closeIO(fileOutputStream);
+            ReferenceCountUtil.release(buffer);
+        }
+    }
+}
diff --git a/orm/src/main/java/com/zfoo/orm/lpmap/HeapMap.java b/orm/src/main/java/com/zfoo/orm/lpmap/HeapMap.java
new file mode 100644
index 00000000..f9294d40
--- /dev/null
+++ b/orm/src/main/java/com/zfoo/orm/lpmap/HeapMap.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2020 The zfoo Authors
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and limitations under the License.
+ */
+
+package com.zfoo.orm.lpmap;
+
+import com.zfoo.protocol.IPacket;
+import io.netty.util.collection.LongObjectHashMap;
+
+import java.util.LinkedList;
+import java.util.Queue;
+
+/**
+ * @author jaysunxiao
+ * @version 3.0
+ */
+public class HeapMap<V extends IPacket> implements LpMap<V> {
+
+    protected LongObjectHashMap<V> map;
+
+    /**
+     * 没有被使用的key
+     */
+    protected Queue<Long> freeKeyQueue = new LinkedList<>();
+
+    protected long index = 0;
+
+    public HeapMap(int initialCapacity) {
+        map = new LongObjectHashMap<>(initialCapacity);
+    }
+
+    @Override
+    public long insert(V packet) {
+        if (freeKeyQueue.isEmpty()) {
+            map.put(++index, packet);
+            return index;
+        } else {
+            var freeKey = freeKeyQueue.poll();
+            map.put(freeKey, packet);
+            return freeKey;
+        }
+    }
+
+    @Override
+    public V put(long key, V packet) {
+        checkKey(key);
+        if (key <= index) {
+            return map.put(key, packet);
+        } else {
+            for (var i = index + 1; i < key; i++) {
+                freeKeyQueue.add(i);
+            }
+            index = key;
+            map.put(key, packet);
+            return null;
+        }
+    }
+
+    @Override
+    public V delete(long key) {
+        checkKey(key);
+        if (key > index) {
+            return null;
+        } else {
+            var previousValue = map.remove(key);
+            freeKeyQueue.add(key);
+            return previousValue;
+        }
+    }
+
+    @Override
+    public V get(long key) {
+        checkKey(key);
+        return map.get(key);
+    }
+}
diff --git a/orm/src/main/java/com/zfoo/orm/lpmap/LpMap.java b/orm/src/main/java/com/zfoo/orm/lpmap/LpMap.java
new file mode 100644
index 00000000..610adc8b
--- /dev/null
+++ b/orm/src/main/java/com/zfoo/orm/lpmap/LpMap.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2020 The zfoo Authors
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and limitations under the License.
+ */
+
+package com.zfoo.orm.lpmap;
+
+import com.zfoo.protocol.IPacket;
+import com.zfoo.protocol.exception.RunException;
+
+/**
+ * 类型固定的map，key为long，value为IPacket
+ * 其中long必须大于0，value可以为null
+ *
+ * @author jaysunxiao
+ * @version 3.0
+ */
+public interface LpMap<V extends IPacket> {
+
+    /**
+     * 插入一条数据，返回一个自增的key，效率比较高
+     */
+    long insert(V packet);
+
+    /**
+     * @param packet the previous value associated with key, or null if there was no mapping for key.
+     */
+    V put(long key, V packet);
+
+    /**
+     * @return 返回被删除的那个值
+     */
+    V delete(long key);
+
+    V get(long key);
+
+    default void checkKey(long key) {
+        if (key <= 0) {
+            throw new RunException("key[{}]不能为负数", key);
+        }
+    }
+
+}
diff --git a/orm/src/test/java/com/zfoo/orm/lpmap/FileHeapMapTest.java b/orm/src/test/java/com/zfoo/orm/lpmap/FileHeapMapTest.java
new file mode 100644
index 00000000..693ce071
--- /dev/null
+++ b/orm/src/test/java/com/zfoo/orm/lpmap/FileHeapMapTest.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2020 The zfoo Authors
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and limitations under the License.
+ */
+
+package com.zfoo.orm.lpmap;
+
+import com.zfoo.orm.lpmap.model.MyPacket;
+import com.zfoo.protocol.ProtocolManager;
+import org.junit.Assert;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import java.io.File;
+import java.util.Set;
+
+/**
+ * @author jaysunxiao
+ * @version 3.0
+ */
+@Ignore
+public class FileHeapMapTest {
+
+    @Test
+    public void test() {
+        ProtocolManager.initProtocol(Set.of(MyPacket.class));
+
+        var map = new FileHeapMap<MyPacket>(new File("myPacket.db"), 10, MyPacket.class);
+        var myPacket = new MyPacket();
+        myPacket.setA(9999);
+
+        var key = map.insert(myPacket);
+        Assert.assertEquals(key, 1L);
+
+        var packet = map.put(1, myPacket);
+        Assert.assertEquals(packet, myPacket);
+
+        packet = map.put(3, myPacket);
+        Assert.assertNull(packet);
+
+        key = map.insert(myPacket);
+        Assert.assertEquals(key, 2L);
+
+        packet = map.delete(4);
+        Assert.assertNull(packet);
+
+        packet = map.delete(3);
+        Assert.assertEquals(packet, myPacket);
+
+        packet = map.delete(2);
+        Assert.assertEquals(packet, myPacket);
+
+        map.put(1, myPacket);
+        map.put(2, myPacket);
+        map.put(3, myPacket);
+        map.put(4, myPacket);
+        map.put(5, myPacket);
+        map.save();
+    }
+
+
+    @Test
+    public void readTest() {
+        ProtocolManager.initProtocol(Set.of(MyPacket.class));
+        var map = new FileHeapMap<MyPacket>(new File("myPacket.db"), 10, MyPacket.class);
+    }
+}
diff --git a/orm/src/test/java/com/zfoo/orm/lpmap/HeapMapTest.java b/orm/src/test/java/com/zfoo/orm/lpmap/HeapMapTest.java
new file mode 100644
index 00000000..46a9c058
--- /dev/null
+++ b/orm/src/test/java/com/zfoo/orm/lpmap/HeapMapTest.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2020 The zfoo Authors
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and limitations under the License.
+ */
+
+package com.zfoo.orm.lpmap;
+
+import com.zfoo.orm.lpmap.model.MyPacket;
+import org.junit.Assert;
+import org.junit.Ignore;
+import org.junit.Test;
+
+/**
+ * @author jaysunxiao
+ * @version 3.0
+ */
+@Ignore
+public class HeapMapTest {
+
+    @Test
+    public void test() {
+        var map = new HeapMap<MyPacket>(10);
+        var myPacket = new MyPacket();
+
+        var key = map.insert(myPacket);
+        Assert.assertEquals(key, 1L);
+
+        var packet = map.put(1, myPacket);
+        Assert.assertEquals(packet, myPacket);
+
+        packet = map.put(3, myPacket);
+        Assert.assertNull(packet);
+
+        key = map.insert(myPacket);
+        Assert.assertEquals(key, 2L);
+
+        packet = map.delete(4);
+        Assert.assertNull(packet);
+
+        packet = map.delete(3);
+        Assert.assertEquals(packet, myPacket);
+
+        packet = map.delete(2);
+        Assert.assertEquals(packet, myPacket);
+    }
+
+}
diff --git a/orm/src/test/java/com/zfoo/orm/lpmap/model/MyPacket.java b/orm/src/test/java/com/zfoo/orm/lpmap/model/MyPacket.java
new file mode 100644
index 00000000..4d1c9be7
--- /dev/null
+++ b/orm/src/test/java/com/zfoo/orm/lpmap/model/MyPacket.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2020 The zfoo Authors
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and limitations under the License.
+ */
+
+package com.zfoo.orm.lpmap.model;
+
+import com.zfoo.protocol.IPacket;
+
+/**
+ * @author jaysunxiao
+ * @version 3.0
+ */
+public class MyPacket implements IPacket {
+
+    public static final transient short PROTOCOL_ID = 1;
+
+    private int a;
+
+    @Override
+    public short protocolId() {
+        return PROTOCOL_ID;
+    }
+
+    public int getA() {
+        return a;
+    }
+
+    public void setA(int a) {
+        this.a = a;
+    }
+}
diff --git a/protocol/src/main/java/com/zfoo/protocol/ProtocolManager.java b/protocol/src/main/java/com/zfoo/protocol/ProtocolManager.java
index f33c7c3e..223127c4 100644
--- a/protocol/src/main/java/com/zfoo/protocol/ProtocolManager.java
+++ b/protocol/src/main/java/com/zfoo/protocol/ProtocolManager.java
@@ -63,7 +63,7 @@ public class ProtocolManager {
 
     public static IProtocolRegistration getProtocol(short protocolId) {
         var protocol = protocols[protocolId];
-        AssertionUtils.notNull(protocol, "[protocolId:{}]协议不存在", protocolId);
+        AssertionUtils.notNull(protocol, "[protocolId:{}]协议不存在，可能没有注册该协议或者协议号错误", protocolId);
         return protocol;
     }
 
diff --git a/protocol/src/main/java/com/zfoo/protocol/registration/ProtocolAnalysis.java b/protocol/src/main/java/com/zfoo/protocol/registration/ProtocolAnalysis.java
index 4749500d..a3bff3cf 100644
--- a/protocol/src/main/java/com/zfoo/protocol/registration/ProtocolAnalysis.java
+++ b/protocol/src/main/java/com/zfoo/protocol/registration/ProtocolAnalysis.java
@@ -494,7 +494,7 @@ public class ProtocolAnalysis {
         throw new RunException("[type:{}]类型不正确", type);
     }
 
-    private static short getProtocolIdByClass(Class<?> clazz) {
+    public static short getProtocolIdByClass(Class<?> clazz) {
         var protocolIdField = ReflectionUtils.getFieldByNameInPOJOClass(clazz, PROTOCOL_ID);
         ReflectionUtils.makeAccessible(protocolIdField);
         return (short) ReflectionUtils.getField(protocolIdField, null);