土石坝坝体在填筑前,必须先将坝面与地基面的交线测放出来,以确定清理范围.坝面一般都由几个不同的平面组合而成,而地基面却往往是不规则的曲面,因此,它们的交线也是一条不规则的曲线.本文介绍一种测放方法,操作简便,结果精确,且只要具有初等几何知识并会使用经纬仪者,就可掌握. Earthworks dam body before filling, we must first measure the intersection of dam surface and the ground surface to determine the clean-up area. Dam surface generally by a combination of several different planes, and the foundation is often not Therefore, the intersection of them is also an irregular curve.This paper introduces a method of measuring and releasing, which is easy to operate and accurate, and can grasp as long as having primary geometric knowledge and using the theodolite.