By using the minute rainfall data of Huangshi and Daye Cities which are located 20 km apart and according to the related standards, this paper calculates the parameters of the rainstorm intensity formula and analyzes the difference of the designed rainfall intensities in the two cities. The results show that in the return period of 0.5-100 years, the rainfall intensity of Huangshi in every period of time (5-120 min) is stronger than Daye’s, getting to 27.34%. Except the annual mean rainfall, the maximum annual rainfall, the maximum monthly rainfall, the maximum daily rainfall, the average annual rainstorm days in Huangshi are more than Daye’s. By analyzing the rainfall data, it is found that Huangshi has bigger average value of the the first maximum rainfall, for the other 7 second heaviest rainfalls, the values for Daye are larger than that for Huangshi. The standard deviation of Huangshi calculated by the first eight maximum precipitation amounts are about 1.4 times more than Daye’s. In short, these results show that the large rainfall in a short time is the cause for the design of the stronger rainfall intensity of Huangshi than Daye’s. The designed rainfall intensity is more sensitive to the first heaviest rainfall and the standard deviation.