The quantitative 24hour forecasting equation of high temperature for Shenzhen is established through multivariate linear regression, by means of the singlefactor analysis method to find the factors closely related to hightemperature weather in Shenzhen under the influence of the peripheral sinking air of tropical cyclones. The trial operational use proved that the forecasting equation is practical, has small error, and can be put into operation. It can also be used as reference in high temperature weather forecasting for other coast areas of China.