The data of thermal infrared remote sensing of Lanzhou receiving station from meteorological satellite on northern Tibet plateau(34°~38° N, 86°~94° E), in three month before Nov. 14, 2001 M_S 8.1 earthquake at Xinjiang-Qinghai border are calculated, analyzed and researched. The results shows that obvious belt anomaly of the earth's surface temperature appeared from on Oct. 17, 2001, the anomalous area became more large and with migration phenomena. The whole anomalous time kept on near one month.