大震及中强震前重力观测台站记录到重力变化已有不少文章论述。本文是在过去前兆清理攻关基础上,对历年来发生在四川境内大震及中强地震之前重力的变化进行了震例总结。为了研究这种震前变化的可信程度,我们讨论了台站观测中主要干扰因素及其对重力值的影响。 There have been a lot of articles elaborated on the gravity changes recorded by the gravity observation stations before and after the strong earthquakes. Based on the previous research on precursor cleanup, this paper summarizes the changes of gravity before the earthquakes in Sichuan and the strong earthquakes in the past years. In order to study the credibility of this pre-earthquake change, we discuss the major disturbing factors in station observations and their effects on gravity.