Abstract: The detailed investigation is carried out in terms of mean monthly, maximum and minimum temperature series of Shanghai from 1880 to 1992. The results indicate that minimum and mean temperatures have obvious increasing trend, especially for the former. From these results, it is known that minimum temperature would be more sensitive to monitor the intensity of greenhouse effect; and maximum temperature exhibited remarkable inflexion trend in the middle and late of 1940s. There were three abrupt warmings, i.e. 1910s, 1930s and the early of 1980s, of the which the first two occurred in daytime, only the last mainly in nighttime. These facts would contribute to renewed study on the warming process of shanghai, China or the globe.