The exploitation of groundwater in the riverside source field is a complex process of surface water and groundwater conversion. At present, numerical models simulating the amount of mining in the riverside source field often generalize the river to the first type of fixed head boundary or the third type of river boundary. The first type of fixed head treatment generalizes the river into an infinite recharge water source, which is obviously impractical for seasonal rivers, while the river boundary does not have the confluence function of SFR, in order to make up for the first type of fixed head boundary model and river boundary model. In the exploitation of surface water and groundwater conversion in the riverside source field, the accuracy of the calculation accuracy is not accurate. In this paper, the SFR model was used to generalize the Jili River and Baima River. According to the riverbed hydraulic conductivity coefficient, river bed thickness, water depth and section shape between the riverbed and groundwater, with the parameters, the river flow and the upstream and downstream water levels in the abundance, flat and dry seasons were calculated and a coupled model of surface water and groundwater was established. The first type of fixed head boundary model and river boundary model were used to generalize the river and the SFR model, the first type of fixed head boundary model and the river boundary model were compared. The results show that the SFR model is in the surface water during the wet, normal and dry seasons. It is more accurate to calculate the relationship between groundwater and surface water conversion and the conversion quantity. According to the SFR model, fixed head boundary and river boundary model, the groundwater recoverable amount in this area is 27.78 million m3/a, 35.11 million m3/a and 25.756 million m3/a respectively. The SFR simulation results are closer to the known groundwater recoverable amount of 28.7 million m3/a in the study area and the conclusions obtained are more reasonable. [ABSTRACT FROM AUTHOR]