To impose restrictions on projection length deformation in large-scale engineering projects especially large span in the east-west direction we usually take the following measures:Change the value of height of compensation plane;Change the value of central meridian;Change the value of central meridian and the height of compensation plane at the same time .This paper analyzes the influence on projection length deformation by changing the central meridian and the height of compensation plane and designs the automatic selection program of central meridian and height of compensa -tion plane ,fulfilling the fast and accurate computation methods of central meridian and the height of compensation plane .%在长跨度大工程项目，尤其是东西跨度较大的项目中，为了限制投影长度的变形，通常采用以下方法：改变抵偿面高程、改变中央子午线、抵偿面高程和中央子午线同时改变。本文通过分析改变抵偿面高程及中央子午线对投影变形的影响，设计出自动选择中央子午线及抵偿面高程的系统，实现了较快较准对长跨度大项目进行分带及抵偿面高程的计算工作。
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