The paper discuss the2items side-length correction of the diggings in Jing-City by3degree strap plane coordinate system,and discuss effect on diggings surveying and adaptive countermeasure.

• 本文论述了晋城矿区西区改用部定三度带平面坐标系后由此引起的两项边长改正,对矿区井上、下测量的影响以及采取的对策。