Abstract: In this paper, based on remote dayA&night sensing data in January, February, July, August of 2006 and January 2007 and July 2008 from NOAA16 and the NOAA18 AVHRR, it analyzes the bright temperature in the central region and the suburbs of Chengdu in different seasons with the geographic information systems,, it studies the spatial distribution of heat island on the day and night of Chengdu city and the relationship between the heat island intensity and the underlying surface.The results show that:in summer, the average intensity of daytime urban heat island is the largest in Chengdu, about 3.7℃;in winter, the intensity is the leastt, only 0.5℃, the average intensity is 1.5℃in summer night and 0.6℃ in winter night.Statistical analysis show that the urban heat island intensity and surface vegetation index was negatively, the relevance of the summer is good and the significance level is 0.01, while in winter, the relevance is poor and the significance levels are relatively low.