diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/JPluginConfig.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/JPluginConfig.kt
new file mode 100644
index 000000000..917a59843
--- /dev/null
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/JPluginConfig.kt
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2020 Mamoe Technologies and contributors.
+ *
+ * 此源代码的使用受 GNU AFFERO GENERAL PUBLIC LICENSE version 3 许可证的约束, 可以在以下链接找到该许可证.
+ * Use of this source code is governed by the GNU AGPLv3 license that can be found through the following link.
+ *
+ * https://github.com/mamoe/mirai/blob/master/LICENSE
+ */
+
+package net.mamoe.mirai.console.data
+
+/**
+ * 一个插件的配置数据, 用于和用户交互.
+ *
+ * 用户可通过 mirai-console 前端 (如在 Android 中可视化实现) 修改这些配置, 修改会自动写入这个对象中.
+ *
+ * **提示**:
+ * 插件内部的数据应用 [PluginData] 存储, 而不能使用 [PluginConfig].
+ *
+ * ### 实现
+ *
+ * 在 [JPluginData] 的示例基础上, 修改类定义
+ * ```java
+ * // 原
+ * public class AccountPluginData extends JPluginData {
+ * // 修改为
+ * public class AccountPluginConfig extends JPluginConfig {
+ * ```
+ * 即可将一个 [PluginData] 变更为 [PluginConfig].
+ *
+ * @see JPluginData
+ * @see PluginConfig
+ */
+public abstract class JPluginConfig(delegate: PluginData) : JPluginData(delegate), PluginConfig
\ No newline at end of file
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/PluginConfig.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/PluginConfig.kt
index 8ba7ba9cc..6ab72da7d 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/PluginConfig.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/PluginConfig.kt
@@ -19,6 +19,24 @@ import kotlin.annotation.AnnotationTarget.*
  *
  * **提示**:
  * 插件内部的数据应用 [PluginData] 存储, 而不能使用 [PluginConfig].
+ *
+ * ## 实现
+ * 对使用者来说, [PluginConfig] 与 [PluginData] 实现几乎相同. 目前仅需在 [PluginData] 使用的基础上添加接口实现即可.
+ *
+ * ### Kotlin
+ * 在 [PluginData] 的示例基础上, 修改对象定义
+ * ```
+ * // 原
+ * object MyPluginData : PluginData by PluginMain.loadPluginData()
+ * // 修改为
+ * object MyPluginConfig : PluginConfig by PluginMain.loadPluginConfig()
+ * ```
+ * 即可将一个 [PluginData] 变更为 [PluginConfig].
+ *
+ * ### Java
+ * 见 [JPluginConfig]
+ *
+ * @see PluginData
  */
 @ExperimentalPluginConfig
 public interface PluginConfig : PluginData
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/PluginData.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/PluginData.kt
index 86dbfe8c5..4de85b27b 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/PluginData.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/data/PluginData.kt
@@ -47,10 +47,11 @@ import kotlin.reflect.KType
  * ```
  * object PluginMain : KotlinPlugin()
  *
- * object AccountPluginData : PluginData by PluginMain.loadPluginData() {
+ * object MyPluginData : PluginData by PluginMain.loadPluginData() {
  *    val list: MutableList<String> by value(mutableListOf("a", "b")) // mutableListOf("a", "b") 是初始值, 可以省略
  *    val custom: Map<Long, CustomData> by value() // 使用 kotlinx-serialization 序列化的类型. (目前还不支持)
- *    var custom2: CustomData by value() // 允许 var
+ *    var long: Long by value(0) // 允许 var
+ *    var int by value(0) // 可以使用类型推断, 但更推荐使用 `var long: Long by value(0)` 这种定义方式.
  * }
  *
  * @Serializable
diff --git a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/data/valueFromKTypeImpl.kt b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/data/valueFromKTypeImpl.kt
index a4dd1d8a1..b9463a6b4 100644
--- a/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/data/valueFromKTypeImpl.kt
+++ b/backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/internal/data/valueFromKTypeImpl.kt
@@ -16,9 +16,9 @@ import net.mamoe.mirai.console.data.PluginData
 import net.mamoe.mirai.console.data.SerializableValue.Companion.serializableValueWith
 import net.mamoe.mirai.console.data.SerializerAwareValue
 import net.mamoe.mirai.console.data.valueFromKType
+import net.mamoe.mirai.console.internal.command.qualifiedNameOrTip
 import kotlin.reflect.KClass
 import kotlin.reflect.KType
-import kotlin.reflect.full.createInstance as createInstanceKotlin
 
 private val primitiveCollectionsImplemented by lazy {
     false
@@ -101,24 +101,36 @@ internal fun PluginData.valueFromKTypeImpl(type: KType): SerializerAwareValue<*>
 
 internal fun KClass<*>.createInstanceSmart(): Any? {
     return when (this) {
+        Byte::class -> 0.toByte()
+        Short::class -> 0.toShort()
+        Int::class -> 0
+        Long::class -> 0L
+        Float::class -> 0.toFloat()
+        Double::class -> 0.0
+
+        Boolean::class -> false
+
+        String::class -> ""
+
         MutableMap::class,
         Map::class,
         LinkedHashMap::class,
         HashMap::class
-        -> mutableMapOf<Any?, Any?>()
+        -> LinkedHashMap<Any?, Any?>()
 
         MutableList::class,
         List::class,
         ArrayList::class
-        -> mutableListOf<Any?>()
+        -> ArrayList<Any?>()
 
         MutableSet::class,
         Set::class,
         LinkedHashSet::class,
         HashSet::class
-        -> mutableSetOf<Any?>()
+        -> LinkedHashSet<Any?>()
 
-        else -> createInstanceKotlin()
+        else -> createInstanceOrNull()
+            ?: error("Cannot create instance or find a initial value for ${this.qualifiedNameOrTip}")
     }
 }