Abstract: In this paper, the effects of sea temperature in Pacific on Aleutian Low in winter are analysed. It is found that there is a close correlation between Aleutian Low in winter and the sea surface temperature in the regions of(40-50°N,160°E-175°W) and (5°-10°S, 145°120°W) East Pacific in Autumn. It is also found that El Nino event could affect the variation of intensity of Aleutian Low in some degree. In addition, the periodic variation of Aleutian Low and its relationship with 500hPa circulation are also discussed.