Based on the two products of infrared from satellite remote sensing, i.e.. Outgoing Longwave Radiation (OLR)and Bright Temperature(BT), the precursor anomaly feature of infrared radiation before west to Kunlun Mountain Pass M 8.1 earthquake on Nov. 14, 2001, is analyzed. The result shows that the increasing anomaly of OLR appeared since a month and BT since a week before the earthquake, and both anomalies stretched along the seismo-tec-tonic zone in the epicenter district.