diff --git a/src/main/java/com/thebeastshop/liteflow/core/FlowExecutor.java b/src/main/java/com/thebeastshop/liteflow/core/FlowExecutor.java
index 7ab5e7e56..49cb0ac93 100644
--- a/src/main/java/com/thebeastshop/liteflow/core/FlowExecutor.java
+++ b/src/main/java/com/thebeastshop/liteflow/core/FlowExecutor.java
@@ -9,6 +9,7 @@
  */
 package com.thebeastshop.liteflow.core;
 
+import java.text.MessageFormat;
 import java.util.List;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
@@ -23,7 +24,11 @@ import com.thebeastshop.liteflow.entity.config.Node;
 import com.thebeastshop.liteflow.entity.config.ThenCondition;
 import com.thebeastshop.liteflow.entity.config.WhenCondition;
 import com.thebeastshop.liteflow.entity.data.DataBus;
-import com.thebeastshop.liteflow.exception.FlowException;
+import com.thebeastshop.liteflow.exception.ChainNotFoundException;
+import com.thebeastshop.liteflow.exception.ComponentNotAccessException;
+import com.thebeastshop.liteflow.exception.FlowExecutorNotInitException;
+import com.thebeastshop.liteflow.exception.FlowSystemException;
+import com.thebeastshop.liteflow.exception.NoAvailableSlotException;
 import com.thebeastshop.liteflow.flow.FlowBus;
 import com.thebeastshop.liteflow.parser.FlowParser;
 
@@ -38,7 +43,8 @@ public class FlowExecutor {
 			try {
 				FlowParser.parseLocal(path);
 			} catch (Exception e) {
-				LOG.error("init flow executor cause error,cannot parse rule file{}", path, e);
+				String errorMsg = MessageFormat.format("init flow executor cause error,cannot parse rule file{}", path);
+				throw new FlowExecutorNotInitException(errorMsg);
 			}
 		}
 	}
@@ -53,13 +59,14 @@ public class FlowExecutor {
 			Chain chain = FlowBus.getChain(chainId);
 			
 			if(chain == null){
-				LOG.error("couldn't find chain with the id[{}]",chainId);
+				String errorMsg = MessageFormat.format("couldn't find chain with the id[{}]", chainId);
+				throw new ChainNotFoundException(errorMsg);
 			}
 			
 			slotIndex = DataBus.offerSlot();
 			LOG.info("slot[{}] offered",slotIndex);
 			if(slotIndex == -1){
-				throw new Exception("there is no available slot");
+				throw new NoAvailableSlotException("there is no available slot");
 			}
 			
 			DataBus.getSlot(slotIndex).setRequestData(param);
@@ -79,14 +86,13 @@ public class FlowExecutor {
 							if(component.isAccess()){
 								component.execute();
 							}else{
-								LOG.error("component[{}] do not gain access",component.getClass().getSimpleName());
-								throw new FlowException("component ["+component.getClass().getSimpleName()+"] do not gain access");
+								String errorMsg = MessageFormat.format("component[{}] do not gain access", component.getClass().getSimpleName());
+								throw new ComponentNotAccessException(errorMsg);
 							}
 						}catch(Throwable t){
 							if(component.isContinueOnError()){
 								LOG.error("component[{}] cause error,but flow is still go on",t,component.getClass().getSimpleName());
 							}else{
-								LOG.error(t.getMessage(),t);
 								throw t;
 							}
 						}
@@ -102,8 +108,7 @@ public class FlowExecutor {
 			DataBus.getSlot(slotIndex).printStep();
 			return DataBus.getSlot(slotIndex).getResponseData();
 		}catch(Exception e){
-			LOG.error("executor cause error",e);
-			throw new FlowException("executor cause error");
+			throw new FlowSystemException("executor cause error");
 		}finally{
 			DataBus.releaseSlot(slotIndex);
 		}
diff --git a/src/main/java/com/thebeastshop/liteflow/exception/ChainNotFoundException.java b/src/main/java/com/thebeastshop/liteflow/exception/ChainNotFoundException.java
new file mode 100644
index 000000000..05ec01fb3
--- /dev/null
+++ b/src/main/java/com/thebeastshop/liteflow/exception/ChainNotFoundException.java
@@ -0,0 +1,21 @@
+package com.thebeastshop.liteflow.exception;
+
+public class ChainNotFoundException extends RuntimeException {
+
+	private static final long serialVersionUID = 1L;
+	
+	/** 异常信息 */
+	private String message;
+
+	public ChainNotFoundException(String message) {
+		this.message = message;
+	}
+
+	public String getMessage() {
+		return message;
+	}
+
+	public void setMessage(String message) {
+		this.message = message;
+	}
+}
diff --git a/src/main/java/com/thebeastshop/liteflow/exception/ComponentNotAccessException.java b/src/main/java/com/thebeastshop/liteflow/exception/ComponentNotAccessException.java
new file mode 100644
index 000000000..bcc118ee4
--- /dev/null
+++ b/src/main/java/com/thebeastshop/liteflow/exception/ComponentNotAccessException.java
@@ -0,0 +1,21 @@
+package com.thebeastshop.liteflow.exception;
+
+public class ComponentNotAccessException extends RuntimeException {
+
+	private static final long serialVersionUID = 1L;
+	
+	/** 异常信息 */
+	private String message;
+
+	public ComponentNotAccessException(String message) {
+		this.message = message;
+	}
+
+	public String getMessage() {
+		return message;
+	}
+
+	public void setMessage(String message) {
+		this.message = message;
+	}
+}
diff --git a/src/main/java/com/thebeastshop/liteflow/exception/FlowExecutorNotInitException.java b/src/main/java/com/thebeastshop/liteflow/exception/FlowExecutorNotInitException.java
new file mode 100644
index 000000000..40fb8d781
--- /dev/null
+++ b/src/main/java/com/thebeastshop/liteflow/exception/FlowExecutorNotInitException.java
@@ -0,0 +1,21 @@
+package com.thebeastshop.liteflow.exception;
+
+public class FlowExecutorNotInitException extends RuntimeException {
+
+	private static final long serialVersionUID = 1L;
+	
+	/** 异常信息 */
+	private String message;
+
+	public FlowExecutorNotInitException(String message) {
+		this.message = message;
+	}
+
+	public String getMessage() {
+		return message;
+	}
+
+	public void setMessage(String message) {
+		this.message = message;
+	}
+}
diff --git a/src/main/java/com/thebeastshop/liteflow/exception/FlowException.java b/src/main/java/com/thebeastshop/liteflow/exception/FlowSystemException.java
similarity index 73%
rename from src/main/java/com/thebeastshop/liteflow/exception/FlowException.java
rename to src/main/java/com/thebeastshop/liteflow/exception/FlowSystemException.java
index e3b1f5e3b..6789c2c51 100644
--- a/src/main/java/com/thebeastshop/liteflow/exception/FlowException.java
+++ b/src/main/java/com/thebeastshop/liteflow/exception/FlowSystemException.java
@@ -1,13 +1,13 @@
 package com.thebeastshop.liteflow.exception;
 
-public class FlowException extends RuntimeException {
+public class FlowSystemException extends RuntimeException {
 
 	private static final long serialVersionUID = 1L;
 	
 	/** 异常信息 */
 	private String message;
 
-	public FlowException(String message) {
+	public FlowSystemException(String message) {
 		this.message = message;
 	}
 
diff --git a/src/main/java/com/thebeastshop/liteflow/exception/NoAvailableSlotException.java b/src/main/java/com/thebeastshop/liteflow/exception/NoAvailableSlotException.java
new file mode 100644
index 000000000..beda393da
--- /dev/null
+++ b/src/main/java/com/thebeastshop/liteflow/exception/NoAvailableSlotException.java
@@ -0,0 +1,21 @@
+package com.thebeastshop.liteflow.exception;
+
+public class NoAvailableSlotException extends RuntimeException {
+
+	private static final long serialVersionUID = 1L;
+	
+	/** 异常信息 */
+	private String message;
+
+	public NoAvailableSlotException(String message) {
+		this.message = message;
+	}
+
+	public String getMessage() {
+		return message;
+	}
+
+	public void setMessage(String message) {
+		this.message = message;
+	}
+}