In the 1990s, the United States proposed a new rainwater management pattern called low-impact development (LID) to alleviate the increasingly serious urban non-point source pollution caused by urbanization. With the wide acceptance of the LID concept, stormwater management model (SWMM) developed by United States Environmental Protection Agency (US EPA) in 1970s, which can simulate the effects of LID facilities in its newest version, is gaining more applications in urban planning. With China's LID- based sponge city construction concept, SWMM has also been widely used in China. So, the study of the reliability and limitations of SWMM model simulation is very important. This study focusses on simulation of pollutant removal in LID facilities. I selected four experimental studies and built models based on the data presented in these studies. After that, the simulation results of the model were compared with the experimental results in the paper. The Wilcoxon signed rank test in the SPSS was used to analyze the reliability. The analysis showed that there is no significant difference between the model simulation results and the experimental results (0.689>0.05), indicating that the model is generally reliable. However, the high requirements of the model for parameter calibration and low flexibility lead to the limitations of the model. At present, the practical experience and theoretical research on the application of LID facilities simulation in SWMM are relatively weak, and further research is needed.