Abstract: Enhanced infrared cloud charts is introduced in South China's typhoon rainfall forecasting by considering the temperature scales of typhoon cloud clusters, their horizintal scales, spirality structures, eye features and entraining clouds from southwest section as well. Some experimental rainfall prediction formula are shown including these factors and typhoon locations. In the case of using pseudo-color digital images, however, some more factors such as the movements of typhoon and the coupling effects of environmental stream fields, must be considered and the heavy rain areas are coincided with the quantitative distribution of some physical factors. Some primarily results are also presented.