Abstract: On the basis ofextracting the clear brightness temperature in GMS-4 infrared data, the tests have been carried out by using three methods for SST retrieval in the North-western Pacific Ocean in August 1993.Considering error amplification is the inherent nature in the single channel physical method,two statistical methods are developed. One is a sing le channel method.Its precision is 1.18℃,which is superior to that ofother similar methods.The otheris a multi-channel method using both TOVS and GM S-4 data.Its precision is 1.06℃,which is matched with that of other current multi-channel statistical methods(0.5-1.36℃).The retriev al SST distributions obtained by the two methods are in good agreement with real observations.