Abstract: The HEC-HMS model is a semi-distributed hydrological model, while the NAM model is a lumped conceptual model. The calculation principle, model architecture and parameter composition of the two models were compared, and the five daily runoff in the Shaheji sub-basin of Chuhe River basin were simulated. The simulation results were used to compare the rainfall runoff simulation performance of the two models. The results show that both models have good simulation results, and the predicted runoff depth is within the allowable error range. Both models have certain limitations in the rainfall and runoff simulation process. The HEC-HMS model has powerful computational function and some parameters can directly reflect the specific characteristics of the basin, but its modeling process is complicated and the internal observed values are difficult to be tested. The NAM modelling process is simple, requires fewer parameters and has clear physical meaning. However, the spatial variation and distribution of runoff producing are ignored in the model calculation process.