diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Contact.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Contact.kt
index 8137a402e..b712fa29e 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Contact.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Contact.kt
@@ -39,7 +39,7 @@ interface Contact : CoroutineScope {
     suspend fun uploadImage(image: ExternalImage): ImageId
 }
 
-suspend inline fun Contact.sendMessage(message: Message) = sendMessage(message.chain())
+suspend inline fun Contact.sendMessage(message: Message) = sendMessage(message.toChain())
 
 suspend inline fun Contact.sendMessage(plain: String) = sendMessage(plain.singleChain())
 
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt
index 96ed916fc..d11c1666f 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/contact/Group.kt
@@ -61,8 +61,6 @@ interface Group : Contact, CoroutineScope/*, Map<UInt, Member>*/ { // TODO: 2019
 
     /**
      * 让机器人退出这个群. 机器人必须为非群主才能退出. 否则将会失败
-     *
-     * @see QuitGroupResponse.isSuccess 判断是否成功
      */
     suspend fun quit(): Boolean
 
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/MessagePacket.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/MessagePacket.kt
index 0387bb327..be7dc9acb 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/MessagePacket.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/MessagePacket.kt
@@ -10,7 +10,6 @@ import net.mamoe.mirai.data.ImageLink
 import net.mamoe.mirai.event.events.BotEvent
 import net.mamoe.mirai.message.data.*
 import net.mamoe.mirai.utils.*
-import net.mamoe.mirai.utils.coerceAtLeastOrFail
 import kotlin.jvm.JvmName
 
 /**
@@ -50,7 +49,7 @@ abstract class MessagePacketBase<TSender : QQ, TSubject : Contact>(_bot: Bot) :
      */
     suspend inline fun reply(message: MessageChain) = subject.sendMessage(message)
 
-    suspend inline fun reply(message: Message) = subject.sendMessage(message.chain())
+    suspend inline fun reply(message: Message) = subject.sendMessage(message.toChain())
     suspend inline fun reply(plain: String) = subject.sendMessage(plain.toMessage())
 
     @JvmName("reply1")
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/MessageChain.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/MessageChain.kt
index df7592cff..8b5b49be4 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/MessageChain.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/MessageChain.kt
@@ -63,7 +63,7 @@ fun MessageChain(initialCapacity: Int): MessageChain =
 
 /**
  * 构造 [MessageChain]
- * 若仅提供一个参数, 请考虑使用 [Message.chain] 以优化性能
+ * 若仅提供一个参数, 请考虑使用 [Message.toChain] 以优化性能
  */
 @Suppress("FunctionName")
 fun MessageChain(vararg messages: Message): MessageChain =
@@ -81,12 +81,12 @@ fun MessageChain(messages: Iterable<Message>): MessageChain =
  * 构造单元素的不可修改的 [MessageChain]. 内部类实现为 [SingleMessageChain]
  *
  * 参数 [delegate] 不能为 [MessageChain] 的实例, 否则将会抛出异常.
- * 使用 [Message.chain] 将帮助提前处理这个问题.
+ * 使用 [Message.toChain] 将帮助提前处理这个问题.
  *
  * @param delegate 所构造的单元素 [MessageChain] 代表的 [Message]
  * @throws IllegalArgumentException 当 [delegate] 为 [MessageChain] 的实例时
  *
- * @see Message.chain receiver 模式
+ * @see Message.toChain receiver 模式
  */
 @MiraiExperimentalAPI
 @UseExperimental(ExperimentalContracts::class)
@@ -106,17 +106,13 @@ fun SingleMessageChain(delegate: Message): MessageChain {
  * 否则将调用 [MessageChain] 构造一个 [MessageChainImpl]
  */
 @Suppress("NOTHING_TO_INLINE")
-inline fun Message.chain(): MessageChain = if (this is MessageChain) this else MessageChain(
-    this
-)
+inline fun Message.toChain(): MessageChain = if (this is MessageChain) this else MessageChain(this)
 
 /**
  * 构造 [MessageChain]
  */
 @Suppress("unused", "NOTHING_TO_INLINE")
-inline fun List<Message>.messageChain(): MessageChain =
-    MessageChain(this)
-
+inline fun List<Message>.toMessageChain(): MessageChain = MessageChain(this)
 
 /**
  * 获取第一个 [M] 类型的 [Message] 实例
@@ -327,6 +323,7 @@ internal inline class MessageChainImpl constructor(
  *
  * 在连接时将会把它当做一个普通 [Message] 看待, 但它不能被 [plusAssign]
  */
+@PublishedApi
 internal inline class SingleMessageChainImpl(
     private val delegate: Message
 ) : Message, MutableList<Message>,
diff --git a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/PlainText.kt b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/PlainText.kt
index 67b784862..72ae01ac0 100644
--- a/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/PlainText.kt
+++ b/mirai-core/src/commonMain/kotlin/net.mamoe.mirai/message/data/PlainText.kt
@@ -23,4 +23,4 @@ inline fun String.toMessage(): PlainText = PlainText(this)
  * @see SingleMessageChainImpl
  */
 @Suppress("NOTHING_TO_INLINE")
-inline fun String.singleChain(): MessageChain = this.toMessage().chain()
\ No newline at end of file
+inline fun String.singleChain(): MessageChain = SingleMessageChainImpl(this.toMessage())
\ No newline at end of file
diff --git a/mirai-japt/mirai-japt.postfixTemplates b/mirai-japt/mirai-japt.postfixTemplates
index 9df0de9fd..030b8a3d7 100644
--- a/mirai-japt/mirai-japt.postfixTemplates
+++ b/mirai-japt/mirai-japt.postfixTemplates
@@ -1,4 +1,5 @@
-# Contact
-
-.blocking : 阻塞式包装
-    net.mamoe.mirai.contact.QQ [net.mamoe.mirai.japt.BlockingContacts] -> BlockingQQ. BlockingContacts.createBlocking($var$)
+## Contact ##
+.blocking : Blocking wrap
+    net.mamoe.mirai.contact.QQ  →  net.mamoe.mirai.japt.BlockingContacts.createBlocking($expr$)
+    net.mamoe.mirai.contact.QQ [net.mamoe.mirai.japt.BlockingContacts]  →  net.mamoe.mirai.japt.BlockingContacts.createBlocking($expr$)
+    net.mamoe.mirai.timpc.network.QQImpl [net.mamoe.mirai.japt.BlockingContacts]  →  net.mamoe.mirai.japt.BlockingContacts.createBlocking($expr$)
\ No newline at end of file
diff --git a/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingBot.java b/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingBot.java
new file mode 100644
index 000000000..b94d6b2b3
--- /dev/null
+++ b/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingBot.java
@@ -0,0 +1,4 @@
+package net.mamoe.mirai.japt;
+
+public interface BlockingBot {
+}
diff --git a/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingContact.java b/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingContact.java
index dcc1585cb..4ea7b98aa 100644
--- a/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingContact.java
+++ b/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingContact.java
@@ -1,7 +1,8 @@
 package net.mamoe.mirai.japt;
 
 import net.mamoe.mirai.Bot;
-import net.mamoe.mirai.message.MessageChain;
+import net.mamoe.mirai.message.data.Message;
+import net.mamoe.mirai.message.data.MessageChain;
 import org.jetbrains.annotations.NotNull;
 
 @SuppressWarnings("unused")
@@ -19,8 +20,16 @@ public interface BlockingContact {
 
     /**
      * 向这个对象发送消息.
-     * <p>
-     * 速度太快会被服务器屏蔽(无响应). 在测试中不延迟地发送 6 条消息就会被屏蔽之后的数据包 1 秒左右.
      */
     void sendMessage(@NotNull MessageChain messages);
+
+    /**
+     * 向这个对象发送消息.
+     */
+    void sendMessage(@NotNull String message);
+
+    /**
+     * 向这个对象发送消息.
+     */
+    void sendMessage(@NotNull Message message);
 }
diff --git a/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingGroup.java b/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingGroup.java
index 37fdc62b1..2805ad9f7 100644
--- a/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingGroup.java
+++ b/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingGroup.java
@@ -1,6 +1,6 @@
 package net.mamoe.mirai.japt;
 
-import net.mamoe.mirai.network.protocol.tim.packet.action.GroupInfo;
+import net.mamoe.mirai.data.GroupInfo;
 
 import java.util.Map;
 
@@ -9,7 +9,7 @@ public interface BlockingGroup extends BlockingContact {
     /**
      * 内部 ID. 内部 ID 为 [GroupId] 的映射
      */
-    Long getInternalId();
+    long getInternalId();
 
     /**
      * 群主 (同步事件更新)
diff --git a/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingQQ.java b/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingQQ.java
index e01aa246c..44145d585 100644
--- a/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingQQ.java
+++ b/mirai-japt/src/main/java/net/mamoe/mirai/japt/BlockingQQ.java
@@ -1,8 +1,8 @@
 package net.mamoe.mirai.japt;
 
-import net.mamoe.mirai.contact.data.Profile;
-import net.mamoe.mirai.network.protocol.tim.packet.action.FriendNameRemark;
-import net.mamoe.mirai.network.protocol.tim.packet.action.PreviousNameList;
+import net.mamoe.mirai.data.FriendNameRemark;
+import net.mamoe.mirai.data.PreviousNameList;
+import net.mamoe.mirai.data.Profile;
 import org.jetbrains.annotations.NotNull;
 
 @SuppressWarnings("unused")
diff --git a/mirai-japt/src/main/kotlin/net/mamoe/mirai/japt/BlockingContactsImpl.kt b/mirai-japt/src/main/kotlin/net/mamoe/mirai/japt/BlockingContactsImpl.kt
index 550d5a807..b15929731 100644
--- a/mirai-japt/src/main/kotlin/net/mamoe/mirai/japt/BlockingContactsImpl.kt
+++ b/mirai-japt/src/main/kotlin/net/mamoe/mirai/japt/BlockingContactsImpl.kt
@@ -8,16 +8,24 @@ import net.mamoe.mirai.contact.Group
 import net.mamoe.mirai.contact.Member
 import net.mamoe.mirai.contact.MemberPermission
 import net.mamoe.mirai.contact.QQ
-import net.mamoe.mirai.contact.data.Profile
-import net.mamoe.mirai.message.MessageChain
-import net.mamoe.mirai.network.protocol.tim.packet.action.FriendNameRemark
-import net.mamoe.mirai.network.protocol.tim.packet.action.GroupInfo
-import net.mamoe.mirai.network.protocol.tim.packet.action.PreviousNameList
+import net.mamoe.mirai.data.FriendNameRemark
+import net.mamoe.mirai.data.GroupInfo
+import net.mamoe.mirai.data.PreviousNameList
+import net.mamoe.mirai.data.Profile
+import net.mamoe.mirai.message.data.Message
+import net.mamoe.mirai.message.data.MessageChain
+import net.mamoe.mirai.message.data.toChain
+import net.mamoe.mirai.message.data.toMessage
+import net.mamoe.mirai.utils.MiraiInternalAPI
+import net.mamoe.mirai.utils.toList
 
 internal class BlockingQQImpl(private val delegate: QQ) : BlockingQQ {
     override fun getBot(): Bot = delegate.bot
-    override fun getId(): Long = delegate.id.toLong()
+    override fun getId(): Long = delegate.id
     override fun sendMessage(messages: MessageChain) = runBlocking { delegate.sendMessage(messages) }
+    override fun sendMessage(message: String) = runBlocking { delegate.sendMessage(message.toMessage().toChain()) }
+    override fun sendMessage(message: Message) = runBlocking { delegate.sendMessage(message.toChain()) }
+
     override fun queryProfile(): Profile = runBlocking { delegate.queryProfile() }
     override fun queryPreviousNameList(): PreviousNameList = runBlocking { delegate.queryPreviousNameList() }
     override fun queryRemark(): FriendNameRemark = runBlocking { delegate.queryRemark() }
@@ -25,17 +33,22 @@ internal class BlockingQQImpl(private val delegate: QQ) : BlockingQQ {
 
 internal class BlockingGroupImpl(private val delegate: Group) : BlockingGroup {
     override fun sendMessage(messages: MessageChain) = runBlocking { delegate.sendMessage(messages) }
+    override fun sendMessage(message: String) = runBlocking { delegate.sendMessage(message.toMessage().toChain()) }
+    override fun sendMessage(message: Message) = runBlocking { delegate.sendMessage(message.toChain()) }
     override fun getOwner(): BlockingMember = delegate.owner.blocking()
     override fun getName(): String = delegate.name
-    override fun getId(): Long = delegate.id.toLong()
+    override fun getId(): Long = delegate.id
     override fun updateGroupInfo(): GroupInfo = runBlocking { delegate.updateGroupInfo() }
     override fun toFullString(): String = delegate.toFullString()
-    override fun getMember(id: Long): BlockingMember = delegate.getMember(id.toUInt()).blocking()
+    override fun getMember(id: Long): BlockingMember = delegate.getMember(id).blocking()
     override fun getBot(): Bot = delegate.bot
     override fun getAnnouncement(): String = delegate.announcement
-    override fun getMembers(): MutableMap<Long, BlockingMember> = delegate.members.mapKeys { it.key.toLong() }.mapValues { it.value.blocking() }.toMutableMap()
-    override fun getInternalId(): Long = delegate.internalId.value.toLong()
-    override fun quit(): Boolean = runBlocking { delegate.quit().isSuccess }
+    @UseExperimental(MiraiInternalAPI::class)
+    override fun getMembers(): Map<Long, BlockingMember> =
+        delegate.members.delegate.toList().associateBy { it.id }.mapValues { it.value.blocking() }
+
+    override fun getInternalId(): Long = delegate.internalId.value
+    override fun quit(): Boolean = runBlocking { delegate.quit() }
 }
 
 internal class BlockingMemberImpl(private val delegate: Member) : BlockingMember {