In order to timely forecast urban floods in Fuzhou City caused by typhoons, we used Xin’anjiang Model to establish a flood forecasting model for the reservoirs in Fuzhou mountainous area during typhoon invasion. Because it was difficult to obtain the data of these reservoirs, the parameters of the Xin’anjiang Model were calibrated and validated by the rainfall and runoff data of Chiqiao station, and then transplanted to each reservoir sub basin for validation. We used six floods caused by typhoons in Chiqiao basin from 2007 to 2015 to carry out the calibration calculation and two in 2016 to validate the calculation results. The model parameters obtained were then transplanted to each reservoir sub basin. Meanwhile, the inflow data of the same period deduced from the precipitation data, water level and discharge process data of Bayi Reservoir and Dengyun Reservoir was adopted to validate the Xin’anjiang Model. The results indicate that Xin’anjiang Model is applicable to Chiqiao Basin, and it works well for single peak rainfall simulations. The method of transplanting the parameters of Xin’anjiang Model obtained from the Chiqiao Basin to other reservoir sub basins for flood forecasting is feasible, and it can be further verified by pending sufficient data.