Land surface temperature(LST)of the 2010 Yushu MS7.1 earthquake is studied by using the Artis algorithm based on the HJ-1B satellite thermal infrared data，and the land surface temperature anomaly identification and test before and after the earthquake is completed. The results show that the initial LST anomaly appeared in the southwest of the epicenter on April 10,2010，and located along the main stress intensification areas，such as the Zanaqu-Zhoxog fault and Zadoi-Shanglaxiu fault. Then the abnormal area expanded gradually to the epicenter，but the mainly high anomaly area was still in the southwest of the epicenter and along the fault zone，which indicates the correlation between the faults and the LST anomaly. LST values of abnormal area on April 26 were significantly lower than the values on April 18 and gradually dissipated，and LST of this region returned to a normal state in late May. LST abnormity before and after the earthquake shows the anomaly change process of anomaly appearance-diffusion and concentration-decaying-disappearing. The pre-earthquake abnormity is evident. At the same time，this paper also calculates the LST results of the same period in 2009 of the same research area as the background information，which further confirms the reliability of LST anomalies as imminent earthquake precursors of the April 14,2010 Yushu earthquake，Qinghai.