A better hydrological model can be developed by coupling and accurately simulating the behavior of farmers’ irrigation, which can be adopted to quantify the influence of farmers’ irrigation on the hydrological cycle in canal-well combined irrigation district. In this paper, Baojixia irrigation district in Shaanxi Province was taken as an example, the question naire and interview methods were adopted first to collect data regarding to agricultural production and farmers irrigation practice. Then the factors affecting irrigation water demand and hydrological processes were analyzed. Finally, a Hydrological-Crop-Livelihood-Utility Model (HCLU) was developed by using Python language, which included hydrological, crop, livelihood and utility modules. In this model, hydrological processes, irrigation practices and crop management had been fully connected to quantify the impacts of irrigation on hydrological cycle and relationship between crop yield and irrigation. This model could be very helpful in terms of providing strong technical support for the sustainable management of water resources in the irrigation district and the adjustment of agricultural planting structure.