The verification of the rainstorm forecast by ECMWF thin grid model products (ECMWF-Thin for short) and SMS-WARMS V1.0 with the resolution of 9 km (SMS-WARMS for short) from East China Regional Meteorological Center for the 35 rainstorm days (26 processes) in the flood season of Shandong Peninsula from 2016 to 2017 is conducted. The results are listed as below. 1) For the precipitation intensity, the weak prediction by ECMWF-Thin leads to high omission rate of rainstorms and torrential rain processes and almost all the torrential rain processes are omitted. When the precipitation is predicted to be more than 50 mm, the probability of rainstorms is over 90%. SMS-WARMS predicts relatively strong precipitation and is of high vacancy rate. SMS-WARMS is generally superior to ECMWF-Thin in predicting the precipitation intensity and possesses the best 24-hour forecast ability. 2) For the beginning time of heavy precipitation, both models are generally predicting later, and the probability of three hours late is greater. Therefore, the precipitation can be suitably predicted to be three hours in advance referring to the conclusion. 3) For the heavy precipitation areas, ECMWF-Thin is slightly better than SMS-WARMS. The latter model is more accurate in forecasting typhoon rainstorm areas, but the areas of other types of rainstorms by the former model are generally to the south or southwest within 1°. Thus forecasters should adjust eastward or northeastward within 1°. 4) For the heavy precipitation range, it is more probable for ECMWF-Thin to forecast a smaller range and SMS-WARMS a larger range. Therefore, it is necessary to integrate two kinds of numerical predictions.