Aiming at the problem of frequent urban rainstorm and waterlogging disasters in recent years, a waterlogging coupled model based on SWMM and LISFLOOD-FP was constructed in Changban Area of Guangzhou as an example. Based on the historical rainstorm events, a new design method of short duration rainstorm process was proposed. On this basis, 114 rainstorm scenarios were designed, and the urban waterlogging response characteristics under different rainstorm rainfall patterns and concentration ratios were discussed. The results show that the overflow and inundation situation under the single peak rain pattern is higher than that under the double peak and uniform patterns. In the single peak rain pattern, the overflow peak of the post peak rainstorm is the highest, the total overflow amount of the mid peak rainstorm and post peak rainstorm is large, and the overall inundation caused by the post peak rainstorm is relatively serious. The inundation caused by Chicago type (r=0.7) rainstorm is the most serious when the return period is less than 50 years, and the inundation caused by single peak type II (post peak type) rainstorm is the most serious when the return period is more than 50 years. The inundation range and water depth of single peak type II with a 100-year return period are 8% and 64% higher than those of Chicago type (r=0.7) rainstorm respectively. Every level rising in rainstorm concentration ratio, the overflow and inundation will be significantly aggravated. At present, the commonly used Chicago rain pattern underestimates the risk of waterlogging under certain circumstances. It is suggested that the more dangerous rain pattern and the rainstorm concentration ratio should be further considered in waterlogging analysis.