diff --git a/app/constants/codes.js b/app/constants/codes.js
index d81e89f..55cde21 100644
--- a/app/constants/codes.js
+++ b/app/constants/codes.js
@@ -91,13 +91,13 @@ const ECodes = {
     code: 'BULK_COPY_PARAMS_ERROR',
     message: 'SourceColumnConfigs and sourceCellValues2dArray must be array.',
   },
-  ORIGINAL_POSITIONS_MISSING: {
-    code: 'ORIGINAL_POSITIONS_MISSING',
-    message: 'OriginalPositions can not be empty.',
+  UNSUPPORTED_POSITION_TYPE: {
+    code: 'UNSUPPORTED_POSITION_TYPE',
+    message: 'Unsupported position type.',
   },
-  ILLEGAL_TARGET_POSITION: {
-    code: 'ILLEGAL_TARGET_POSITION',
-    message: 'Illegal targetPosition.',
+  ILLEGAL_POSITION: {
+    code: 'ILLEGAL_POSITION',
+    message: 'Illegal position.',
   },
   USER_NOT_FOUND: {
     code: 'USER_NOT_FOUND',
diff --git a/app/controllers/positions.js b/app/controllers/positions.js
index 43394d3..ff4bb1c 100644
--- a/app/controllers/positions.js
+++ b/app/controllers/positions.js
@@ -1,36 +1,15 @@
 const posQueries = require('../queries/positions');
+const { POSITION_TYPE } = require('../constants/app');
+const { error, Status, ECodes } = require('../util/error');
 
 module.exports = {
-  changePosition({ originalPositions, targetPosition, parentId, type }) {
-    targetPosition = parseInt(targetPosition);
-    originalPositions = Array.from(originalPositions, i => parseInt(i));
-    originalPositions.sort();
-    const originLen = originalPositions.length;
-    const minPosition = Math.min(originalPositions[0], targetPosition);
-    const maxPosition = Math.max(
-      originalPositions[originLen - 1],
-      targetPosition,
-    );
-    const temp = originalPositions.reduce((sum, originalPosition) => {
-      if (originalPosition < targetPosition) sum++;
-      return sum;
-    }, 0);
-    let movedNum = 0;
-    let sql = `update positions set position = case`;
-    for (let i = minPosition; i <= maxPosition; i++) {
-      if (originalPositions.indexOf(i) === -1) {
-        if (i >= targetPosition) {
-          sql += ` when position = ${i} then ${i + originLen - movedNum}`;
-        } else {
-          sql += ` when position = ${i} then ${i - movedNum}`;
-        }
-      } else {
-        sql += ` when position = ${i} then ${targetPosition - temp + movedNum}`;
-        movedNum++;
-      }
-    }
-    sql += ` else position end where "parentId" = ? and "type" = ?`;
-    return posQueries.query(sql, { replacements: [parentId, type] });
+  changePosition(params) {
+    if (
+      params.type === POSITION_TYPE.FIELD &&
+      (params.targetPosition === 1 || params.originalPosition === 1)
+    )
+      error(Status.Forbidden, ECodes.ILLEGAL_POSITION);
+    return posQueries.updateOne(params);
   },
 
   async create({ siblingId, parentId, type }) {
diff --git a/app/controllers/tables.js b/app/controllers/tables.js
index dc37bd2..a64a50d 100644
--- a/app/controllers/tables.js
+++ b/app/controllers/tables.js
@@ -6,7 +6,7 @@ const fldController = require('../controllers/fields');
 const fldValController = require('../controllers/fieldValues');
 const { POSITION_TYPE } = require('../constants/app');
 const { error, Status, ECodes } = require('../util/error');
-const { checkKeyExists, trim } = require('../util/helper');
+const { checkKeyExists, trim, getUniqueName } = require('../util/helper');
 const { checkType } = require('../util/fieldTypes');
 
 const checkTable = async id => {
@@ -22,16 +22,6 @@ const checkNameWithinBase = async (baseId, name) => {
   if (table) error(Status.Forbidden, ECodes.TABLE_NAME_EXIST, name);
 };
 
-const getUniqueTableName = async (baseId, tableName, index = 0) => {
-  let newTableName = index ? `${tableName} (${index})` : tableName;
-  const table = await tblQueries.getTableByBaseAndName(baseId, newTableName);
-  if (table) {
-    index++;
-    return await getUniqueTableName(baseId, tableName, index);
-  }
-  return newTableName;
-};
-
 module.exports = {
   checkTable,
   async createNewTableSet(params) {
@@ -116,11 +106,13 @@ module.exports = {
     let tblFvFlag = [];
     let tblFldFlag = [];
     let tableSchemas = [];
+    const tableNamesResult = await tblQueries.getTableNames(baseId);
+    const tableNames = tableNamesResult.map(i => i.name.toLowerCase());
     for (const table of tables) {
       checkKeyExists(table, 'name', 'fields');
       table.name = trim(table.name);
       if (table.name === '') error(null, ECodes.TABLE_NAME_EMPTY);
-      table.name = await getUniqueTableName(baseId, table.name);
+      table.name = getUniqueName(tableNames, table.name);
       tblRecords.push({ baseId, name: table.name });
       const tableNum = tblRecords.length;
       fldRecords[tableNum - 1] = [];
@@ -129,16 +121,19 @@ module.exports = {
       let tblFvNum = 0;
       let index = 0;
       let tableSchema = { name: table.name, id: null, columns: [] };
+      let fieldNames = [];
       for (const field of table.fields) {
         let tblRows = 0;
         checkKeyExists(field, 'name', 'type', 'typeOptions', 'values');
         field.name = trim(field.name);
         if (field.name === '') field.name = 'Unknown Field ' + ++index;
+        field.name = getUniqueName(fieldNames, field.name);
         fldRecords[tableNum - 1].push({
           name: field.name,
           fieldTypeId: await checkType(field.type),
           typeOptions: field.typeOptions,
         });
+        fieldNames.push(field.name.toLowerCase());
         const fvLen = field.values.length;
         tblFvNum += fvLen;
         if (fvLen > tblMaxRows) {
@@ -194,10 +189,6 @@ module.exports = {
       tableSchemas[i].id = tblResults[i].id;
       for (let j = 0; j < fldRecords[i].length; j++) {
         fldRecords[i][j].tableId = tblResults[i].id;
-        await fldController.checkFieldByTableAndName(
-          tblResults[i].id,
-          fldRecords[i][j].name,
-        );
         fldPosRecords.push({
           parentId: tblResults[i].id,
           siblingId: null,
diff --git a/app/queries/positions.js b/app/queries/positions.js
index be83dda..78bb974 100644
--- a/app/queries/positions.js
+++ b/app/queries/positions.js
@@ -6,6 +6,7 @@ const {
   sequelize,
 } = require('../models');
 const { POSITION_TYPE } = require('../constants/app');
+const { error, Status, ECodes } = require('../util/error');
 
 const POSITION_MODELS = {
   [POSITION_TYPE.BASE]: BasePositions,
@@ -42,4 +43,19 @@ module.exports = {
     const PosModel = POSITION_MODELS[type];
     return PosModel.bulkCreate(records);
   },
+
+  updateOne(params) {
+    const tableName =
+      params.type.slice(0, 1).toUpperCase() +
+      params.type.slice(1) +
+      'Positions';
+    const sql = `update "${tableName}" set "position" = case when "position"=${
+      params.originalPosition
+    } then ${params.targetPosition} when "position"=${
+      params.targetPosition
+    } then ${params.originalPosition} else "position" end where "parentId"='${
+      params.parentId
+    }'`;
+    return sequelize.query(sql);
+  },
 };
diff --git a/app/queries/tables.js b/app/queries/tables.js
index 5b87079..f4bc723 100644
--- a/app/queries/tables.js
+++ b/app/queries/tables.js
@@ -113,4 +113,11 @@ module.exports = {
   bulkCreate(records) {
     return Tables.bulkCreate(records);
   },
+
+  getTableNames(baseId) {
+    return Tables.findAll({
+      attributes: ['name'],
+      where: { baseId },
+    });
+  },
 };
diff --git a/app/resolvers/positions.js b/app/resolvers/positions.js
index c67f299..5ab009f 100644
--- a/app/resolvers/positions.js
+++ b/app/resolvers/positions.js
@@ -1,23 +1,23 @@
 const { checkKeyExists } = require('../util/helper');
 const posController = require('../controllers/positions');
 const socketIo = require('../../lib/socketIo');
-const { error, Status, ECodes } = require('../util/error');
+const { sequelize } = require('../models/index');
+const { POSITION_TYPE } = require('../constants/app');
 
 const changePosition = async ctx => {
   const params = ctx.request.body;
   checkKeyExists(
     params,
-    'originalPositions',
+    'originalPosition',
     'targetPosition',
     'parentId',
     'type',
   );
-  if (params.originalPositions.length === 0)
-    error(null, ECodes.ORIGINAL_POSITIONS_MISSING);
-  if (!(params.targetPosition > 1)) error(null, ECodes.ILLEGAL_TARGET_POSITION);
-  if (!Array.isArray(params.originalPositions))
-    params.originalPositions = [params.originalPositions];
-  await posController.changePosition(params);
+  params.originalPosition = parseInt(params.originalPosition);
+  params.targetPosition = parseInt(params.targetPosition);
+  if (!(params.originalPosition > 0) || !(params.targetPosition > 0))
+    error(Status.Forbidden, ECodes.ILLEGAL_POSITION);
+  await sequelize.transaction(() => posController.changePosition(params));
   ctx.body = { message: 'success' };
   socketIo.sync({
     op: 'changePosition',
diff --git a/app/router/index.js b/app/router/index.js
index c4cdb46..44991dc 100644
--- a/app/router/index.js
+++ b/app/router/index.js
@@ -52,8 +52,8 @@ router.delete('/api/array-field-item', fldValResolver.deleteArrayValue);
 // TODO fix bulk copy
 // router.post('/api/bulk-copy-field-value', resolveBulkCopyFieldValue);
 
-// //Position
-// router.put('/api/change-position', posResolver.changePosition);
+//Position
+router.put('/api/change-position', posResolver.changePosition);
 
 //FieldTypes
 router.get('/api/fieldTypes', fldTypesResolver.getAll);
diff --git a/app/util/helper.js b/app/util/helper.js
index 3d363c3..d22d430 100755
--- a/app/util/helper.js
+++ b/app/util/helper.js
@@ -44,9 +44,19 @@ const trim = str => {
   return str.toString().replace(/(^\s*)|(\s*$)/g, '');
 };
 
+const getUniqueName = (names, name, index = 0) => {
+  let newName = index ? `${name} (${index})` : name;
+  if (names.indexOf(newName.toLowerCase()) !== -1) {
+    index++;
+    return getUniqueName(names, name, index);
+  }
+  return newName;
+};
+
 module.exports = {
   load,
   sha1,
   checkKeyExists,
   trim,
+  getUniqueName,
 };