diff --git a/dbswitch-core/src/main/java/com/weishao/dbswitch/core/service/impl/MigrationConvertServiceImpl.java b/dbswitch-core/src/main/java/com/weishao/dbswitch/core/service/impl/MigrationConvertServiceImpl.java
index c3d98d38..45d6620d 100644
--- a/dbswitch-core/src/main/java/com/weishao/dbswitch/core/service/impl/MigrationConvertServiceImpl.java
+++ b/dbswitch-core/src/main/java/com/weishao/dbswitch/core/service/impl/MigrationConvertServiceImpl.java
@@ -23,6 +23,7 @@ import com.weishao.dbswitch.core.util.JdbcUrlUtils;
 /**
  * 结构迁移转换实现类
  * 备注：字段信息、主键、生成建表的SQL语句
+ * 说明：不支持并发调用，调用方需要做并发一致性保证
  * 
  * @author tang
  *
diff --git a/dbswitch-webapi/src/main/java/com/weishao/dbswitch/webapi/config/AdapterBeanConfiguration.java b/dbswitch-webapi/src/main/java/com/weishao/dbswitch/webapi/config/AdapterBeanConfiguration.java
index 0f8386aa..1f88b79a 100644
--- a/dbswitch-webapi/src/main/java/com/weishao/dbswitch/webapi/config/AdapterBeanConfiguration.java
+++ b/dbswitch-webapi/src/main/java/com/weishao/dbswitch/webapi/config/AdapterBeanConfiguration.java
@@ -9,12 +9,15 @@
 /////////////////////////////////////////////////////////////
 package com.weishao.dbswitch.webapi.config;
 
+import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Scope;
+
 import com.weishao.dbswitch.core.service.IMigrationService;
+import com.weishao.dbswitch.core.service.impl.MigrationConvertServiceImpl;
 import com.weishao.dbswitch.sql.service.ISqlConvertService;
 import com.weishao.dbswitch.sql.service.ISqlGeneratorService;
-import com.weishao.dbswitch.core.service.impl.MigrationConvertServiceImpl;
 import com.weishao.dbswitch.sql.service.impl.CalciteSqlConvertServiceImpl;
 import com.weishao.dbswitch.sql.service.impl.MyselfSqlGeneratorServiceImpl;
 
@@ -22,6 +25,7 @@ import com.weishao.dbswitch.sql.service.impl.MyselfSqlGeneratorServiceImpl;
 public class AdapterBeanConfiguration {
 	
 	@Bean("MigrationService")
+	@Scope(BeanDefinition.SCOPE_PROTOTYPE)
 	public IMigrationService getMigrationService() {
 		return new MigrationConvertServiceImpl();
 	}
diff --git a/dbswitch-webapi/src/main/java/com/weishao/dbswitch/webapi/controller/StructureController.java b/dbswitch-webapi/src/main/java/com/weishao/dbswitch/webapi/controller/StructureController.java
index 3dfdf31b..503b9529 100644
--- a/dbswitch-webapi/src/main/java/com/weishao/dbswitch/webapi/controller/StructureController.java
+++ b/dbswitch-webapi/src/main/java/com/weishao/dbswitch/webapi/controller/StructureController.java
@@ -9,29 +9,32 @@
 /////////////////////////////////////////////////////////////
 package com.weishao.dbswitch.webapi.controller;
 
-import java.util.Map;
-import java.util.Objects;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
-import io.swagger.annotations.Api;
-import io.swagger.annotations.ApiOperation;
+import java.util.Map;
+import java.util.Objects;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+import org.springframework.http.MediaType;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
 import com.alibaba.fastjson.JSON;
 import com.alibaba.fastjson.JSONObject;
 import com.google.common.base.Strings;
 import com.weishao.dbswitch.common.constant.DatabaseTypeEnum;
 import com.weishao.dbswitch.core.model.ColumnDescription;
 import com.weishao.dbswitch.core.model.DatabaseDescription;
-import com.weishao.dbswitch.webapi.model.ResponseResult;
 import com.weishao.dbswitch.core.model.TableDescription;
 import com.weishao.dbswitch.core.service.IMigrationService;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.beans.factory.annotation.Qualifier;
-import org.springframework.http.MediaType;
-import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestMethod;
-import org.springframework.web.bind.annotation.RestController;
+import com.weishao.dbswitch.webapi.model.ResponseResult;
+
+import io.swagger.annotations.Api;
+import io.swagger.annotations.ApiOperation;
 
 @Api(tags = { "表结构抽取转换接口" })
 @RestController
@@ -39,8 +42,11 @@ import org.springframework.web.bind.annotation.RestController;
 public class StructureController {
 
 	@Autowired
-	@Qualifier("MigrationService")
-	private IMigrationService migrationService;
+	private ApplicationContext applicationContext;
+
+	private IMigrationService getMigrationService() {
+		return (IMigrationService) applicationContext.getBean("MigrationService");
+	}
 	
 	@RequestMapping(value = "/models_list", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
 	@ApiOperation(value = "查询所有的模式(model/schema)", notes = "获取数据库中所有的模式(model/schema),，请求的示例包体格式为：\n"
@@ -99,6 +105,7 @@ public class StructureController {
 			}
 		}
 
+		IMigrationService migrationService=this.getMigrationService();
 		DatabaseDescription databaseDesc = new DatabaseDescription(type, host, port, mode, dbname, charset, user,passwd);
 		migrationService.setDatabaseConnection(databaseDesc);
 		return ResponseResult.success(migrationService.querySchemaList());
@@ -164,6 +171,7 @@ public class StructureController {
 			}
 		}
 		
+		IMigrationService migrationService=this.getMigrationService();
 		DatabaseDescription databaseDesc=new DatabaseDescription(type, host, port, mode, dbname, charset, user, passwd);
 		migrationService.setDatabaseConnection(databaseDesc);
 		List<TableDescription> tables=migrationService.queryTableList(model);
@@ -244,7 +252,7 @@ public class StructureController {
 		}
 
 		Map<String, Object> ret = new HashMap<String, Object>();
-
+		IMigrationService migrationService=this.getMigrationService();
 		DatabaseDescription databaseDesc = new DatabaseDescription(type, host, port, mode, dbname, charset, user, passwd);
 		migrationService.setDatabaseConnection(databaseDesc);
 		List<ColumnDescription> columnDescs = migrationService.queryTableColumnMeta(model, src_table);
@@ -343,6 +351,7 @@ public class StructureController {
 			}
 		}
 		
+		IMigrationService migrationService=this.getMigrationService();
 		DatabaseDescription databaseDesc=new DatabaseDescription(type, host, port, mode, dbname, charset, user, passwd);
 		migrationService.setDatabaseConnection(databaseDesc);
 		List<ColumnDescription> columnDescs=migrationService.querySqlColumnMeta(querysql);
@@ -443,6 +452,7 @@ public class StructureController {
 			}
 		}
 		
+		IMigrationService migrationService=this.getMigrationService();
 		DatabaseDescription databaseDesc=new DatabaseDescription(type, host, port, mode, dbname, charset, user, passwd);
 		DatabaseTypeEnum taregetDabaseType=DatabaseTypeEnum.valueOf(target.toUpperCase());
 		migrationService.setDatabaseConnection(databaseDesc);
@@ -547,6 +557,7 @@ public class StructureController {
 			}
 		}
 		
+		IMigrationService migrationService=this.getMigrationService();
 		DatabaseDescription databaseDesc=new DatabaseDescription(type, host, port, mode, dbname, charset, user, passwd);
 		migrationService.setDatabaseConnection(databaseDesc);
 		migrationService.testQuerySQL(querysql);