Abstract:The anomaly change of PWV after earthquakes is analyzed through the change of PWV time series in the epicenter of the east Japan, Wenchuan, and Yushu earthquakes. First, we analyze the change of MODIS PWV sequence in the epicenter and the change of radiosonde PWV sequence near the epicenter before and after the earthquake. Then, based on the high correlation between GNSS ZTD and PWV, for GNSS PWV replaced by GNSS ZTD, we analyze the change of GNSS ZTD sequence of IGS sites around the epicenter. It is found that after the earthquake, the change of PWV in or near the epicenter is abnormal, and the closer the distance, the greater change of PWV. For PWV accumulating continuously, the precipitation occurs after the peak of PWV.