diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/BinaryStream.java b/mirai-core/src/main/java/net/mamoe/mirai/network/BinaryStream.java
new file mode 100644
index 000000000..ed862b37b
--- /dev/null
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/BinaryStream.java
@@ -0,0 +1,8 @@
+package net.mamoe.mirai.network;
+
+/**
+ * @author Him188moe @ Mirai Project
+ */
+public class BinaryStream {
+
+}
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/Packet.java b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/Packet.java
new file mode 100644
index 000000000..8c6fec9cb
--- /dev/null
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/Packet.java
@@ -0,0 +1,8 @@
+package net.mamoe.mirai.network.packet;
+
+/**
+ * @author Him188moe @ Mirai Project
+ */
+public interface Packet {
+
+}
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/PacketId.java b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/PacketId.java
new file mode 100644
index 000000000..c0d6ef6a9
--- /dev/null
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/PacketId.java
@@ -0,0 +1,11 @@
+package net.mamoe.mirai.network.packet;
+
+/**
+ * @author Him188moe @ Mirai Project
+ */
+public @interface PacketId {
+    /**
+     * 获取用于识别的包 ID
+     */
+    int value();
+}
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientLoginPacket.java b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientLoginPacket.java
new file mode 100644
index 000000000..c15fbfb6b
--- /dev/null
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientLoginPacket.java
@@ -0,0 +1,14 @@
+package net.mamoe.mirai.network.packet.client;
+
+import net.mamoe.mirai.network.packet.PacketId;
+
+/**
+ * @author Him188moe @ Mirai Project
+ */
+@PacketId(5)
+public class ClientLoginPacket extends ClientPacket {
+    @Override
+    public void encode() {
+
+    }
+}
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.java b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.java
new file mode 100644
index 000000000..700d4990f
--- /dev/null
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/client/ClientPacket.java
@@ -0,0 +1,24 @@
+package net.mamoe.mirai.network.packet.client;
+
+import net.mamoe.mirai.network.packet.Packet;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+
+/**
+ * @author Him188moe @ Mirai Project
+ */
+public abstract class ClientPacket extends DataOutputStream implements Packet {
+    public ClientPacket() {
+        super(new ByteArrayOutputStream());
+    }
+
+    public long readQQ() {
+
+    }
+
+    /**
+     * Encode this packet
+     */
+    public abstract void encode();
+}
diff --git a/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/ServerPacket.java b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/ServerPacket.java
new file mode 100644
index 000000000..fb6470e5b
--- /dev/null
+++ b/mirai-core/src/main/java/net/mamoe/mirai/network/packet/server/ServerPacket.java
@@ -0,0 +1,23 @@
+package net.mamoe.mirai.network.packet.server;
+
+import net.mamoe.mirai.network.packet.Packet;
+import org.jetbrains.annotations.NotNull;
+
+import java.io.ByteArrayInputStream;
+import java.io.DataInputStream;
+import java.io.InputStream;
+
+/**
+ * @author Him188moe @ Mirai Project
+ */
+public abstract class ServerPacket extends DataInputStream implements Packet {
+    public ServerPacket(@NotNull InputStream in) {
+        super(in);
+    }
+
+    public ServerPacket(@NotNull byte[] in) {
+        this(new ByteArrayInputStream(in));
+    }
+
+    public abstract void decode();
+}