Based on the NCEP reanalysis data of wind, humidity, vertical velocity and the surface observation data of Shenzhen, the main warming factors are explored under the influence of peripheral circulation of tropical cyclones. According to thermodynamic energy equation, the contribution rate of every warming factor is estimated. Results are indicated as follows: Nonadiabatic term is the basis of high temperature in Shenzhen; the warming proportion is 90.2%; and the warming rate is 0.83 ℃?h-1. If assuming the warming rate unchanged from 08:00 to 14:00, then temperature would increase by 5.0 ℃ from 08:00 to 14:00 caused by the nonadiabatic term. The second important reason for hightemperature includes the decrease of relative humidity, air sinking warming, and warm advection. Their respective proportions are 7.6%,3.8% and 7.0%,〖HJ〗 with a total of warming rate of 0.17 ℃?h-1. Temperature increases 1.12 ℃ from 08:00 to 14:00 caused by these 3 terms. Therefore the greatest contribution to high temperature is made by the nonadiabatic term including decrease of relative humidity. Smaller contribution is made by dry air adiabatic subsidence. Larger contribution is made by warm advection.