Research conclusions: Compared with the traditional trigonometric leveling method，the middle way trigonometric leveling method is innovative in field operating ． The advantage of this method is that it can basically eliminate atmospheric refraction and earth curvature effects and can get results quickly without measuring instrument and prism heights． Because of its simpleness and efficiency，this method can be widely used to reach second － class standard of elevation measurement requirements． Additionally ，to develop the more appropriate technical parameters for some measurement tolerance (such as vertical angle Index Error between observation sets and divergence of Index Error)，we should do more testing and do more analysis of test results in the course of future measurement．