A model for the growth of the late rice variety "Wufugen" to-gether with diagnostic suggestions is presented using the statistical method based on secular climatic data and crop growth observations at Changzhou and taking into account the rice ecological principle and cultivation experiences. A microcomputer expert system displayed in Chinese characters is used to predict the dynamic conditions of the phenological phases and yield components of rice. The result of this research is suitable to the present scientific and technical levels of China’s basic departments responsible for agricultural production andcan be used to direct productive activities in large areas.