The theory and method of these two type absolute gravimeters are given in this paper.The paper emphasizes a small cam-driven absolute gravimeter which have been developped in recent years.

• 本文分别介绍了经典绝对重力仪和原子干涉绝对重力仪的测量原理及方法，重点介绍了国际上新出现的凸轮式绝对重力仪。