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Propagation model is the basic of radio network planning in mobile communication system. It is related with the rationality of network planning directly whether the propagation model is exact or not. In order to obtain the radio propagation model reflecting propagation characteristic in Chinese city environment, and then direct radio network planning of the third generation (3G) communication system rather better, a simple linear-iterative tuning method based on linear least square theory is proposed in this paper. This method depends on existed tuning methods and radio propagation testing data of a certain city. Furthermore, using this method can obtain exact outdoor propagation model fitting for 3G system. Results of experiment show that the calculating complexity is reduced obviously. When it is used to model tuning in small and medium-sized city, the average error of forecasting data calculated by tuned model reduces by 14 dB. The veracity of propagation model is advanced greatly.