The synopticclimatic characteristics and the influential system of hightemperature weather are studied through the analysis of hightemperature processes from 1954 to 2005. The features of the hightemperature distribution under different weather systems are also analyzed and the forecasting procedures for hightemperature weather are designed. It is proved that the number of hightemp erature days has an increasing tendency; the subtropical high pressure is a very important weather system inducing the hightemperature weather in Shenzhen; the peripheral sinking air around a tropical cyclone is mainly responsible for the occurrence of the hightemperature weather in Shenzhen; the spatial distribution of high temperature has clearly geographical characteristics with the decreasing temperature from the north to the south, and the hightemperature areas in Shenzhen have obvious differences under different weather systems.