diff --git a/mirai-core-api/src/commonMain/kotlin/utils/BotConfiguration.kt b/mirai-core-api/src/commonMain/kotlin/utils/BotConfiguration.kt
index 482a434a9..41add713a 100644
--- a/mirai-core-api/src/commonMain/kotlin/utils/BotConfiguration.kt
+++ b/mirai-core-api/src/commonMain/kotlin/utils/BotConfiguration.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2020 Mamoe Technologies and contributors.
+ * Copyright 2019-2021 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.
@@ -7,7 +7,7 @@
  *  https://github.com/mamoe/mirai/blob/master/LICENSE
  */
 
-@file:Suppress("unused", "DEPRECATION_ERROR", "EXPOSED_SUPER_CLASS")
+@file:Suppress("unused", "DEPRECATION_ERROR", "EXPOSED_SUPER_CLASS", "MemberVisibilityCanBePrivate")
 
 package net.mamoe.mirai.utils
 
@@ -25,7 +25,7 @@ import kotlin.coroutines.coroutineContext
  *
  * Kotlin 使用方法:
  * ```
- * val bot = Bot(...) {
+ * val bot = BotFactory.newBot(...) {
  *    // 在这里配置 Bot
  *
  *    bogLoggerSupplier = { bot -> ... }
@@ -45,6 +45,11 @@ import kotlin.coroutines.coroutineContext
  */
 @Suppress("PropertyName")
 public open class BotConfiguration { // open for Java
+    /**
+     * 工作目录. 默认为 "."
+     */
+    public var workingDir: File = File(".")
+
     /**
      * 日志记录器
      *
@@ -146,8 +151,23 @@ public open class BotConfiguration { // open for Java
         }
     }
 
+    /**
+     * 使用文件存储设备信息.
+     *
+     * 此函数只在 JVM 和 Android 有效. 在其他平台将会抛出异常.
+     * @param filepath 文件路径. 默认是相对于 [workingDir] 的文件 "device.json".
+     * @see deviceInfo
+     */
+    @JvmOverloads
+    @ConfigurationDsl
+    public fun fileBasedDeviceInfo(filepath: String = "device.json") {
+        deviceInfo = getFileBasedDeviceInfoSupplier { workingDir.resolve(filepath) }
+    }
+
+
     /**
      * 重定向 [网络日志][networkLoggerSupplier] 到指定目录. 若目录不存在将会自动创建 ([File.mkdirs])
+     * 默认目录路径为 "$workingDir/logs/".
      * @see DirectoryLogger
      * @see redirectNetworkLogToDirectory
      */
@@ -159,12 +179,11 @@ public open class BotConfiguration { // open for Java
         identity: (bot: Bot) -> String = { "Net ${it.id}" }
     ) {
         require(!dir.isFile) { "dir must not be a file" }
-        dir.mkdirs()
-        networkLoggerSupplier = { DirectoryLogger(identity(it), dir, retain) }
+        networkLoggerSupplier = { DirectoryLogger(identity(it), workingDir.resolve(dir), retain) }
     }
 
     /**
-     * 重定向 [网络日志][networkLoggerSupplier] 到指定文件.
+     * 重定向 [网络日志][networkLoggerSupplier] 到指定文件. 默认文件路径为 "$workingDir/mirai.log".
      * 日志将会逐行追加到此文件. 若文件不存在将会自动创建 ([File.createNewFile])
      * @see SingleFileLogger
      * @see redirectNetworkLogToDirectory
@@ -176,25 +195,7 @@ public open class BotConfiguration { // open for Java
         identity: (bot: Bot) -> String = { "Net ${it.id}" }
     ) {
         require(!file.isDirectory) { "file must not be a dir" }
-        file.createNewFile()
-        networkLoggerSupplier = { SingleFileLogger(identity(it), file) }
-    }
-
-    /**
-     * 重定向 [Bot 日志][botLoggerSupplier] 到指定目录. 若目录不存在将会自动创建 ([File.mkdirs])
-     * @see DirectoryLogger
-     * @see redirectBotLogToFile
-     */
-    @JvmOverloads
-    @ConfigurationDsl
-    public fun redirectBotLogToDirectory(
-        dir: File = File("logs"),
-        retain: Long = 1.weeksToMillis,
-        identity: (bot: Bot) -> String = { "Net ${it.id}" }
-    ) {
-        require(!dir.isFile) { "dir must not be a file" }
-        dir.mkdirs()
-        botLoggerSupplier = { DirectoryLogger(identity(it), dir, retain) }
+        networkLoggerSupplier = { SingleFileLogger(identity(it), workingDir.resolve(file)) }
     }
 
     /**
@@ -210,8 +211,24 @@ public open class BotConfiguration { // open for Java
         identity: (bot: Bot) -> String = { "Net ${it.id}" }
     ) {
         require(!file.isDirectory) { "file must not be a dir" }
-        file.createNewFile()
-        botLoggerSupplier = { SingleFileLogger(identity(it), file) }
+        botLoggerSupplier = { SingleFileLogger(identity(it), workingDir.resolve(file)) }
+    }
+
+
+    /**
+     * 重定向 [Bot 日志][botLoggerSupplier] 到指定目录. 若目录不存在将会自动创建 ([File.mkdirs])
+     * @see DirectoryLogger
+     * @see redirectBotLogToFile
+     */
+    @JvmOverloads
+    @ConfigurationDsl
+    public fun redirectBotLogToDirectory(
+        dir: File = File("logs"),
+        retain: Long = 1.weeksToMillis,
+        identity: (bot: Bot) -> String = { "Net ${it.id}" }
+    ) {
+        require(!dir.isFile) { "dir must not be a file" }
+        botLoggerSupplier = { DirectoryLogger(identity(it), workingDir.resolve(dir), retain) }
     }
 
     public enum class MiraiProtocol {
@@ -240,35 +257,6 @@ public open class BotConfiguration { // open for Java
         public val Default: BotConfiguration = BotConfiguration()
     }
 
-    /**
-     * 使用文件存储设备信息.
-     *
-     * 此函数只在 JVM 和 Android 有效. 在其他平台将会抛出异常.
-     * @param filepath 文件路径. 可相对于程序运行路径 (`user.dir`), 也可以是绝对路径.
-     * @see deviceInfo
-     */
-    @JvmOverloads
-    @ConfigurationDsl
-    public fun fileBasedDeviceInfo(filepath: String = "device.json") {
-        deviceInfo = getFileBasedDeviceInfoSupplier(filepath)
-    }
-
-    public fun copy(): BotConfiguration {
-        return BotConfiguration().also { new ->
-            new.botLoggerSupplier = botLoggerSupplier
-            new.networkLoggerSupplier = networkLoggerSupplier
-            new.deviceInfo = deviceInfo
-            new.parentCoroutineContext = parentCoroutineContext
-            new.heartbeatPeriodMillis = heartbeatPeriodMillis
-            new.heartbeatTimeoutMillis = heartbeatTimeoutMillis
-            new.firstReconnectDelayMillis = firstReconnectDelayMillis
-            new.reconnectPeriodMillis = reconnectPeriodMillis
-            new.reconnectionRetryTimes = reconnectionRetryTimes
-            new.loginSolver = loginSolver
-            new.protocol = protocol
-        }
-    }
-
 
     /**
      * 不显示网络日志. 不推荐.
@@ -346,6 +334,24 @@ public open class BotConfiguration { // open for Java
         parentCoroutineContext = coroutineContext
     }
 
+
+    public fun copy(): BotConfiguration {
+        return BotConfiguration().also { new ->
+            new.botLoggerSupplier = botLoggerSupplier
+            new.networkLoggerSupplier = networkLoggerSupplier
+            new.deviceInfo = deviceInfo
+            new.parentCoroutineContext = parentCoroutineContext
+            new.heartbeatPeriodMillis = heartbeatPeriodMillis
+            new.heartbeatTimeoutMillis = heartbeatTimeoutMillis
+            new.firstReconnectDelayMillis = firstReconnectDelayMillis
+            new.reconnectPeriodMillis = reconnectPeriodMillis
+            new.reconnectionRetryTimes = reconnectionRetryTimes
+            new.loginSolver = loginSolver
+            new.protocol = protocol
+        }
+    }
+
+
     /** 标注一个配置 DSL 函数 */
     @Target(AnnotationTarget.FUNCTION)
     @DslMarker
diff --git a/mirai-core-api/src/commonMain/kotlin/utils/LoginSolver.kt b/mirai-core-api/src/commonMain/kotlin/utils/LoginSolver.kt
index 66f92789a..3edc305a6 100644
--- a/mirai-core-api/src/commonMain/kotlin/utils/LoginSolver.kt
+++ b/mirai-core-api/src/commonMain/kotlin/utils/LoginSolver.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-2020 Mamoe Technologies and contributors.
+ * Copyright 2019-2021 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.
@@ -221,9 +221,9 @@ public class StandardCharImageLoginSolver @JvmOverloads constructor(
 //////////////// internal
 ///////////////////////////////
 
-internal fun BotConfiguration.getFileBasedDeviceInfoSupplier(filename: String): (Bot) -> DeviceInfo {
+internal fun BotConfiguration.getFileBasedDeviceInfoSupplier(file: () -> File): (Bot) -> DeviceInfo {
     return {
-        File(filename).loadAsDeviceInfo(json)
+        file().loadAsDeviceInfo(json)
     }
 }