Abstract: Based on the statistics of 654 meteorological observatories extending from 1970 to 1979, cumulative distribution of rainfall rate is studied applying geographic information system technology, including rainfall rate exceeding an average of 0 01% for the year, season, month and the worst month. An effective new approach is used to study on the 1 min rainfall rate in the region where no rainfall information is available. This approach can be regarded as a supplement to the ITU R Rep. 563 4 et al. The results can be used to obtain the propagation path loss in frequency bands above 10 GHz and are of importance to radio spectrum management and the design of radio communication systems.