中文摘要：

为检验模型在无率定情况下可能造成的误差，选用SWMM、MikeUrban和InfoWorksICM这三种模型模拟北京建筑工程学院校园的降雨径流情况，模拟时各模型都采用各自的默认参数。结果表明，对于特定的模拟结果，各模型间均存在正相关，且都达到极显著水平；在默认参数下，模拟结果对于模型本身是精确的，默认参数的不同引起了各模型模拟结果的偏差。因此，当利用模型模拟研究区域时，参数率定和验证很有必要。

英文摘要：

To examine errors caused by using default parameters, three models SWMM, Mike Ur- ban and InfoWorks ICM were utilized to simulate the stormwater runoff in a campus. The models were run using their respective default parameters. The results showed that for a given simulation result, there was a significant positive correlation among the three models. When using the default parameters, the simula- tion result for the model itself was accurate, and the deviation between the simulation results was caused by different default parameters. Therefore, when using the model to simulate the study area, parameter calibration and validation are necessary.