Using global gravity anomaly data which were calculated from 106 months of continuous Grace ( Gravity Recovery And Climate Experiment) data, based on empirical orthogonal function method, time-varying characteristics of the gravity anomaly is analyzed. The results show that: the temporal variation gravity field signal originates mainly from the sea water movement, and mostly is located at the zonal between south latitude 40 degree and north latitude 40 degree.%利用Grace(Gravity Recovery And Climate Experiment)106个月连续重力异常数据,基于经验正交函数分析方法,分析了重力异常时变特征,得出了地球重力场时变信号主要起源于海水质量的移动,位于南纬40°与北纬40°带之间的结论.
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