diff --git a/src/main/java/com/serliunx/statemanagement/machine/AbstractStateMachine.java b/src/main/java/com/serliunx/statemanagement/machine/AbstractStateMachine.java
index 2df3eec..2715ad0 100644
--- a/src/main/java/com/serliunx/statemanagement/machine/AbstractStateMachine.java
+++ b/src/main/java/com/serliunx/statemanagement/machine/AbstractStateMachine.java
@@ -6,7 +6,6 @@ import com.serliunx.statemanagement.machine.handler.StateHandlerWrapper;
 import com.serliunx.statemanagement.manager.AbstractStateManager;
 
 import java.util.List;
-import java.util.Map;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.TimeUnit;
@@ -29,22 +28,15 @@ public abstract class AbstractStateMachine<S> extends AbstractStateManager<S> im
     /**
      * 默认的构造函数
      *
-     * @param entryHandlers 	进入事件处理器集合
-     * @param leaveHandlers 	离开事件处理器集合
-     * @param exchangeHandlers	交换事件处理器集合
-     * @param executor 			异步执行器
-     * @param async 			是否异步执行
+     * @param stateList 状态列表
+     * @param context   状态机上下文
      */
-    AbstractStateMachine(List<S> stateList,
-                         Map<S, List<StateHandlerWrapper<S>>> entryHandlers,
-                         Map<S, List<StateHandlerWrapper<S>>> leaveHandlers,
-                         Map<String, List<StateHandlerWrapper<S>>> exchangeHandlers,
-                         Map<Object, List<Consumer<StateMachine<S>>>> eventRegistries,
-                         Executor executor,
-                         Boolean async
-    ) {
+    public AbstractStateMachine(List<S> stateList, StateMachineContext<S> context) {
         super(stateList);
-        context = new StateMachineContext<>(entryHandlers, leaveHandlers, exchangeHandlers, eventRegistries, executor, async);
+        this.context = context;
+
+        // 设置初始状态
+        tryInitialState();
     }
 
     @Override
@@ -303,4 +295,13 @@ public abstract class AbstractStateMachine<S> extends AbstractStateManager<S> im
                 stateHandler.handle(params);
         });
     }
+
+    /**
+     * 尝试设置初始状态(如果有指定的话)
+     */
+    private void tryInitialState() {
+        if (context.initialState != null) {
+            switchTo(context.initialState, false);
+        }
+    }
 }
diff --git a/src/main/java/com/serliunx/statemanagement/machine/DefaultConcurrentStateMachine.java b/src/main/java/com/serliunx/statemanagement/machine/DefaultConcurrentStateMachine.java
index 4e80863..a10ad7f 100644
--- a/src/main/java/com/serliunx/statemanagement/machine/DefaultConcurrentStateMachine.java
+++ b/src/main/java/com/serliunx/statemanagement/machine/DefaultConcurrentStateMachine.java
@@ -23,13 +23,15 @@ public class DefaultConcurrentStateMachine<S> extends AbstractStateMachine<S> im
     private final AtomicInteger index = new AtomicInteger(0);
 
     DefaultConcurrentStateMachine(List<S> stateList,
-                                         Map<S, List<StateHandlerWrapper<S>>> entryHandlers,
-                                         Map<S, List<StateHandlerWrapper<S>>> leaveHandlers,
-                                         Map<String, List<StateHandlerWrapper<S>>> exchangeHandlers,
-                                         Map<Object, List<Consumer<StateMachine<S>>>> eventRegistries,
-                                         Executor executor,
-                                         Boolean async) {
-        super(stateList, entryHandlers, leaveHandlers, exchangeHandlers, eventRegistries, executor, async);
+                                  Map<S, List<StateHandlerWrapper<S>>> entryHandlers,
+                                  Map<S, List<StateHandlerWrapper<S>>> leaveHandlers,
+                                  Map<String, List<StateHandlerWrapper<S>>> exchangeHandlers,
+                                  Map<Object, List<Consumer<StateMachine<S>>>> eventRegistries,
+                                  Executor executor,
+                                  Boolean async,
+                                  S initialState
+    ) {
+        super(stateList, new StateMachineContext<>(entryHandlers, leaveHandlers, exchangeHandlers, eventRegistries, executor, async, initialState));
     }
 
     @Override
diff --git a/src/main/java/com/serliunx/statemanagement/machine/StandardStateMachine.java b/src/main/java/com/serliunx/statemanagement/machine/StandardStateMachine.java
index 143a201..59e1d50 100644
--- a/src/main/java/com/serliunx/statemanagement/machine/StandardStateMachine.java
+++ b/src/main/java/com/serliunx/statemanagement/machine/StandardStateMachine.java
@@ -31,8 +31,10 @@ public class StandardStateMachine<S> extends AbstractStateMachine<S> implements
 						 Map<String, List<StateHandlerWrapper<S>>> exchangeHandlers,
 						 Map<Object, List<Consumer<StateMachine<S>>>> eventRegistries,
 						 Executor executor,
-						 Boolean async
+						 Boolean async,
+						 S initialState
 	) {
-		super(stateList, entryHandlers, leaveHandlers, exchangeHandlers, eventRegistries, executor, async);
+		super(stateList, new StateMachineContext<>(entryHandlers, leaveHandlers, exchangeHandlers, eventRegistries,
+				executor, async, initialState));
 	}
 }
diff --git a/src/main/java/com/serliunx/statemanagement/machine/StateMachineBuilder.java b/src/main/java/com/serliunx/statemanagement/machine/StateMachineBuilder.java
index 087a4cf..257027f 100644
--- a/src/main/java/com/serliunx/statemanagement/machine/StateMachineBuilder.java
+++ b/src/main/java/com/serliunx/statemanagement/machine/StateMachineBuilder.java
@@ -32,6 +32,10 @@ public final class StateMachineBuilder<S> {
 	 * 状态机类型
 	 */
 	private StateMachineType type = StateMachineType.STANDARD;
+	/**
+	 * 初始化状态
+	 */
+	private S initialState;
 
 	/**
 	 * 各种事件
@@ -49,6 +53,15 @@ public final class StateMachineBuilder<S> {
 		this(Arrays.asList(states));
 	}
 
+	/**
+	 * 定义初始状态
+	 *
+	 * @param initialState	初始状态
+	 */
+	public StateMachineBuilder<S> withInitial(S initialState) {
+		this.initialState = initialState;
+		return this;
+	}
 
 	/**
 	 * 添加交换事件
@@ -252,10 +265,10 @@ public final class StateMachineBuilder<S> {
 		}
 		if (type.equals(StateMachineType.STANDARD)) {
 			return (M)new StandardStateMachine<>(stateList, entryHandlers,
-					leaveHandlers, exchangeHandlers, eventRegistries, executor, async);
+					leaveHandlers, exchangeHandlers, eventRegistries, executor, async, initialState);
 		} else if (type.equals(StateMachineType.CONCURRENT)) {
 			return (M)new DefaultConcurrentStateMachine<>(stateList, entryHandlers,
-					leaveHandlers, exchangeHandlers, eventRegistries, executor, async);
+					leaveHandlers, exchangeHandlers, eventRegistries, executor, async, initialState);
 		}
 		throw new IllegalArgumentException("未知的状态机类型: " + type);
 	}
diff --git a/src/main/java/com/serliunx/statemanagement/machine/StateMachineContext.java b/src/main/java/com/serliunx/statemanagement/machine/StateMachineContext.java
index 20bf5ea..0756da3 100644
--- a/src/main/java/com/serliunx/statemanagement/machine/StateMachineContext.java
+++ b/src/main/java/com/serliunx/statemanagement/machine/StateMachineContext.java
@@ -7,9 +7,6 @@ import com.serliunx.statemanagement.support.ExecutorUtils;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.Executor;
-import java.util.concurrent.RejectedExecutionHandler;
-import java.util.concurrent.ThreadPoolExecutor;
-import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.Consumer;
 
 /**
@@ -47,13 +44,18 @@ public final class StateMachineContext<S> {
 	 * 当具体的执行器没有指定是否异步时, 将根据该值决定是否异步执行.
 	 */
 	final Boolean async;
+	/**
+	 * 初始化状态
+	 */
+	final S initialState;
 
-	StateMachineContext(Map<S, List<StateHandlerWrapper<S>>> entryHandlers,
-						 Map<S, List<StateHandlerWrapper<S>>> leaveHandlers,
-						 Map<String, List<StateHandlerWrapper<S>>> exchangeHandlers,
-						 Map<Object, List<Consumer<StateMachine<S>>>> eventRegistries,
-						 Executor executor,
-						 Boolean async
+	public StateMachineContext(Map<S, List<StateHandlerWrapper<S>>> entryHandlers,
+							   Map<S, List<StateHandlerWrapper<S>>> leaveHandlers,
+							   Map<String, List<StateHandlerWrapper<S>>> exchangeHandlers,
+							   Map<Object, List<Consumer<StateMachine<S>>>> eventRegistries,
+							   Executor executor,
+							   Boolean async,
+							   S initialState
 	) {
 		this.entryHandlers = entryHandlers;
 		this.leaveHandlers = leaveHandlers;
@@ -61,6 +63,17 @@ public final class StateMachineContext<S> {
 		this.executor = executorAutoConfiguration(executor);
 		this.async = async;
 		this.eventRegistries = eventRegistries;
+		this.initialState = initialState;
+	}
+
+	public StateMachineContext(Map<S, List<StateHandlerWrapper<S>>> entryHandlers,
+						 Map<S, List<StateHandlerWrapper<S>>> leaveHandlers,
+						 Map<String, List<StateHandlerWrapper<S>>> exchangeHandlers,
+						 Map<Object, List<Consumer<StateMachine<S>>>> eventRegistries,
+						 Executor executor,
+						 Boolean async
+	) {
+		this(entryHandlers, leaveHandlers, exchangeHandlers, eventRegistries, executor, async, null);
 	}
 
 	/**
diff --git a/src/main/java/com/serliunx/statemanagement/manager/AbstractStateManager.java b/src/main/java/com/serliunx/statemanagement/manager/AbstractStateManager.java
index b96615c..1187316 100644
--- a/src/main/java/com/serliunx/statemanagement/manager/AbstractStateManager.java
+++ b/src/main/java/com/serliunx/statemanagement/manager/AbstractStateManager.java
@@ -26,6 +26,11 @@ public abstract class AbstractStateManager<S> implements StateManager<S> {
 	 */
 	private volatile int index;
 
+	/**
+	 * 默认状态序号
+	 */
+	private int defaultIndex = 0;
+
 	/**
 	 * 锁
 	 */
@@ -180,7 +185,7 @@ public abstract class AbstractStateManager<S> implements StateManager<S> {
 	 * @return 是第一个时返回真, 否则返回假.
 	 */
 	protected boolean isFirst() {
-		return index == getDefault();
+		return index == 0;
 	}
 
 	/**
@@ -203,6 +208,15 @@ public abstract class AbstractStateManager<S> implements StateManager<S> {
 	 * 状态序号默认值(等同于默认状态)
 	 */
 	protected int getDefault() {
-		return 0;
+		return defaultIndex;
+	}
+
+	/**
+	 * 设置默认值
+	 *
+	 * @param defaultIndex	默认值
+	 */
+	protected void setDefault(int defaultIndex) {
+		this.defaultIndex = defaultIndex;
 	}
 }
diff --git a/src/test/java/com/serliunx/statemanagement/MachineTest.java b/src/test/java/com/serliunx/statemanagement/MachineTest.java
index 73a58e8..949ed3b 100644
--- a/src/test/java/com/serliunx/statemanagement/MachineTest.java
+++ b/src/test/java/com/serliunx/statemanagement/MachineTest.java
@@ -7,8 +7,6 @@ import com.serliunx.statemanagement.support.PrinterEvent;
 import com.serliunx.statemanagement.support.PrinterState;
 import org.junit.Test;
 
-import java.util.concurrent.Executors;
-
 /**
  * 状态机测试
  *
@@ -21,23 +19,12 @@ public class MachineTest {
 	@Test
 	public void testStandardStateMachine() throws Exception {
 		StateMachine<PrinterState> stateMachine = StateMachineBuilder.from(PrinterState.values())
-				.async(false)
+				.async(true)
 				.standard()
-				.exchange(PrinterState.IDLE, PrinterState.SCANNING, h -> {
-					System.out.println("hello~");
-				})
-				.whenLeave(PrinterState.IDLE, h -> {
-					System.out.println(Thread.currentThread().getName() + ": leave IDLE");
-				})
-				.whenEntry(PrinterState.STOPPING, h -> {
-					System.out.println(Thread.currentThread().getName() + ": entry STOPPING, from " + h.getFrom());
-				})
-				.whenEntry(PrinterState.STOPPED, h -> {
-					System.out.println(Thread.currentThread().getName() + ": entry STOPPED, from " + h.getFrom());
-				})
+				.withInitial(PrinterState.STOPPING)
 				.build();
 
-		stateMachine.switchTo(PrinterState.SCANNING);
+		System.out.println(stateMachine.current());
 	}
 
 	@Test