diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/Bot.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/Bot.kt
index b070224bb..47ae5a1c3 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/Bot.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/Bot.kt
@@ -9,7 +9,10 @@ import net.mamoe.mirai.Bot.ContactSystem
 import net.mamoe.mirai.contact.*
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.network.protocol.tim.TIMBotNetworkHandler
+import net.mamoe.mirai.network.protocol.tim.packet.action.CanAddFriendPacket
+import net.mamoe.mirai.network.protocol.tim.packet.action.CanAddFriendResponse
 import net.mamoe.mirai.network.protocol.tim.packet.login.LoginResult
+import net.mamoe.mirai.network.sessionKey
 import net.mamoe.mirai.utils.BotConfiguration
 import net.mamoe.mirai.utils.DefaultLogger
 import net.mamoe.mirai.utils.MiraiLogger
@@ -90,6 +93,8 @@ class Bot(val account: BotAccount, val logger: MiraiLogger) {
      * @see Bot.contacts
      */
     inner class ContactSystem internal constructor() {
+        inline val bot: Bot get() = this@Bot
+
         private val _groups = ContactList<Group>()
         private lateinit var groupsUpdater: Job
         val groups = ContactList<Group>()
@@ -108,7 +113,7 @@ class Bot(val account: BotAccount, val logger: MiraiLogger) {
         suspend fun getQQ(id: UInt): QQ =
             if (qqs.containsKey(id)) qqs[id]!!
             else qqsLock.withLock {
-                qqs.getOrPut(id) { QQ(this@Bot, id) }
+                qqs.getOrPut(id) { QQ(bot, id) }
             }
 
         /**
@@ -126,7 +131,7 @@ class Bot(val account: BotAccount, val logger: MiraiLogger) {
         suspend fun getGroup(id: GroupId): Group = id.value.let {
             if (groups.containsKey(it)) groups[it]!!
             else groupsLock.withLock {
-                groups.getOrPut(it) { Group(this@Bot, id) }
+                groups.getOrPut(it) { Group(bot, id) }
             }
         }
 
@@ -153,7 +158,19 @@ class Bot(val account: BotAccount, val logger: MiraiLogger) {
     }
 }
 
+suspend fun ContactSystem.canAddFriend(id: UInt): CanAddFriendResponse =
+    bot.withSession {
+        CanAddFriendPacket(bot.qqAccount, id, bot.sessionKey).sendAndExpect<CanAddFriendResponse>().await()
+    }
+
 /**
  * 添加一个好友
+ *
+ * @param lazyMessage 若需要验证请求时的验证消息.
  */
-suspend fun ContactSystem.addFriend(id: UInt): Nothing = TODO()
\ No newline at end of file
+suspend fun ContactSystem.addFriend(id: UInt, lazyMessage: () -> String = { "" }): Boolean = when (this.canAddFriend(id)) {
+    is CanAddFriendResponse.AlreadyAdded -> false
+    is CanAddFriendResponse.Rejected -> false
+    is CanAddFriendResponse.RequireVerification -> TODO()
+    is CanAddFriendResponse.ReadyToAdd -> TODO()
+}
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotHelper.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotHelper.kt
index 7be94d166..c6f4936f1 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotHelper.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/BotHelper.kt
@@ -6,11 +6,13 @@ import net.mamoe.mirai.contact.*
 import net.mamoe.mirai.network.BotNetworkHandler
 import net.mamoe.mirai.network.BotSession
 import net.mamoe.mirai.network.protocol.tim.packet.OutgoingPacket
+import net.mamoe.mirai.network.protocol.tim.packet.action.CanAddFriendResponse
 import net.mamoe.mirai.network.protocol.tim.packet.login.LoginResult
 import net.mamoe.mirai.network.session
 import net.mamoe.mirai.utils.BotConfiguration
 import net.mamoe.mirai.utils.internal.PositiveNumbers
 import net.mamoe.mirai.utils.internal.coerceAtLeastOrFail
+import kotlin.jvm.JvmOverloads
 
 /*
  * 在 [Bot] 中的方法的捷径
@@ -18,6 +20,7 @@ import net.mamoe.mirai.utils.internal.coerceAtLeastOrFail
 
 //Contacts
 suspend inline fun Bot.getQQ(@PositiveNumbers number: Long): QQ = this.contacts.getQQ(number.coerceAtLeastOrFail(0).toUInt())
+
 suspend inline fun Bot.getQQ(number: UInt): QQ = this.contacts.getQQ(number)
 
 suspend inline fun Bot.getGroup(id: UInt): Group = this.contacts.getGroup(GroupId(id))
@@ -59,6 +62,17 @@ suspend inline fun Bot.login(noinline configuration: BotConfiguration.() -> Unit
  */
 suspend inline fun Bot.login(): LoginResult = this.network.login(BotConfiguration.Default)
 
+/**
+ * 得到可否添加这个人为好友
+ */
+suspend inline fun Bot.canAddFriend(id: UInt): CanAddFriendResponse = this.contacts.canAddFriend(id)
+
+/**
+ * 添加好友
+ */
+@JvmOverloads
+suspend inline fun Bot.addFriend(id: UInt, noinline lazyMessage: () -> String = { "" }) = this.contacts.addFriend(id, lazyMessage)
+
 /**
  * 取得机器人的 QQ 号
  */
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotSession.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotSession.kt
index 962aed329..f90b2230c 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotSession.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/network/BotSession.kt
@@ -6,6 +6,12 @@ import kotlinx.coroutines.CompletableDeferred
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Job
 import net.mamoe.mirai.Bot
+import net.mamoe.mirai.contact.Group
+import net.mamoe.mirai.contact.GroupId
+import net.mamoe.mirai.contact.GroupInternalId
+import net.mamoe.mirai.contact.QQ
+import net.mamoe.mirai.getGroup
+import net.mamoe.mirai.getQQ
 import net.mamoe.mirai.network.protocol.tim.TIMBotNetworkHandler
 import net.mamoe.mirai.network.protocol.tim.handler.ActionPacketHandler
 import net.mamoe.mirai.network.protocol.tim.handler.DataPacketSocketAdapter
@@ -13,7 +19,10 @@ import net.mamoe.mirai.network.protocol.tim.handler.TemporaryPacketHandler
 import net.mamoe.mirai.network.protocol.tim.packet.OutgoingPacket
 import net.mamoe.mirai.network.protocol.tim.packet.Packet
 import net.mamoe.mirai.network.protocol.tim.packet.SessionKey
+import net.mamoe.mirai.sendPacket
 import net.mamoe.mirai.utils.getGTK
+import net.mamoe.mirai.utils.internal.PositiveNumbers
+import net.mamoe.mirai.utils.internal.coerceAtLeastOrFail
 import kotlin.coroutines.coroutineContext
 
 /**
@@ -100,6 +109,17 @@ class BotSession(
         sendAndExpect<P, P>(checkSequence) { it }
 
     suspend inline fun OutgoingPacket.send() = socket.sendPacket(this)
+
+
+    suspend inline fun Int.qq(): QQ = bot.getQQ(this.coerceAtLeastOrFail(0).toUInt())
+    suspend inline fun Long.qq(): QQ = bot.getQQ(this.coerceAtLeastOrFail(0))
+    suspend inline fun UInt.qq(): QQ = bot.getQQ(this)
+
+    suspend inline fun Int.group(): Group = bot.getGroup(this.coerceAtLeastOrFail(0).toUInt())
+    suspend inline fun Long.group(): Group = bot.getGroup(this.coerceAtLeastOrFail(0))
+    suspend inline fun UInt.group(): Group = bot.getGroup(GroupId(this))
+    suspend inline fun GroupId.group(): Group = bot.getGroup(this)
+    suspend inline fun GroupInternalId.group(): Group = bot.getGroup(this)
 }
 
 
@@ -128,4 +148,20 @@ inline val Bot.session: BotSession get() = this.network.session
  * 取得 [Bot] 的 `sessionKey`.
  * 实际上是一个捷径.
  */
-inline val Bot.sessionKey: SessionKey get() = this.session.sessionKey
\ No newline at end of file
+inline val Bot.sessionKey: SessionKey get() = this.session.sessionKey
+
+
+/**
+ * 发送数据包
+ * @throws IllegalStateException 当 [BotNetworkHandler.socket] 未开启时
+ */
+suspend inline fun BotSession.sendPacket(packet: OutgoingPacket) = this.bot.sendPacket(packet)
+
+
+suspend inline fun BotSession.getQQ(@PositiveNumbers number: Long): QQ = this.bot.getQQ(number)
+suspend inline fun BotSession.getQQ(number: UInt): QQ = this.bot.getQQ(number)
+
+suspend inline fun BotSession.getGroup(id: UInt): Group = this.bot.getGroup(id)
+suspend inline fun BotSession.getGroup(@PositiveNumbers id: Long): Group = this.bot.getGroup(id)
+suspend inline fun BotSession.getGroup(id: GroupId): Group = this.bot.getGroup(id)
+suspend inline fun BotSession.getGroup(internalId: GroupInternalId): Group = this.bot.getGroup(internalId)
\ No newline at end of file