Based on the daily precipitation data in 62 meteorological stations and typhoon track data in Zhejiang Province from 1971 to 2018, the frequency and intensity of typhoon rainstorm were identified. The rational typhoon rainstorm samples for frequency fitting were extracted by a Peaks-Over-Threshold (POT) method based on Quantile-Graph (QQ graph) method. Then, the generalized Pareto distribution (GPD distribution) was adopted to fit the samples of maximum 1-, 2- and 3-days typhoon rainstorm to reveal the intensity-duration-frequency relationships. Generally, indexes of average annual typhoon frequency and total typhoon precipitation decreased from trend from the southeast to the west of Zhejiang Provence. The results of Kolmogorov-Smirnov (K-S) test and the fitting of theoretical-empirical curves certified the well-fitting of GPD distribution on extreme typhoon rainstorm samples. The maximum 1-day, 2-day and 3-day typhoon rainstorm also showed a decreasing pattern from the eastern coast to the western inland of Zhejiang Province.