Soil water content at different soil depths is simulated using distributed hydrological model and crop model.Leaf area index(LAI)

increment of dry matter

and grain yield are simulated respectively using the crop model

together with linked distributed hydrological model and the crop model only.Finally

the spatial distribution of grain yield in the whole watershed is simulated using the crop model linking distributed hydrological model.Results show that the accuracy of soil water content simulated by distributed hydrological model is higher than that calculated by crop model.The accuracy of winter wheat growth and grain yield simulated by the crop model linking distributed hydrological model is higher than that simulated by crop model only.The simulation of spatial distribution of grain yield is consistent with that of observed yield and statistical yield on the whole

and the distribution in high yield region and low yield region is consistent with the actual distribution

basically.The study is a fundamental trial of the application of crop model coupled with distributed hydrological model and attempts to promote the development of the research on crop model and yield forecast through incorporating distributed hydrological model into crop model.