Abstract: In this paper,we analyzed the abnormal dist urbances of ionosphere within 20 days before and after the Yushu earthquake on April 13,2010, with the sliding quarter-back anomaly detection method, on the basis of the international ionosphere GPS TEC (GIM) data provided by JPL and electron density profile from COSMIC. The results show that the ionospheric TEC anomalies started from l1 days before the earthquake,and ab-normal increase of TEC appeared on April 13 while the peak electron density varied in the similar trend. Considering the space activities, we suggest that these anomalies may relate to the Yushu eart hquake.

Key words: Ionospheric anomaly, GPS TEC, COSMIC, Electron density profile, The 2010 Yushu M_s7.1 earthquake