Abstract: There was so long period of overwinter dormancy during development of winter wheat in North China that the simulation results of crop model could be improved by correct simulation of overwinter process of wheat. In this paper, against climate characteristic and ecologic type of winter wheat variety in North China, parameters of WOFOST was adjusted based on meteorological index of overwinter process of wheat in China, which made this model can simulate phenological phase of overwinter. Biomass weight in turn-green was re-initialized using optimum method (FSEOPT) according to measured data. Thus, WOFOST can simulate the change in biomass of winter during overwinter in North China, and simulated ability of WOFOST was improved. This research would be a foudation of adaptation of WOFOST in simulating development of winter wheat and regional application in North China.

Key words: WOFOST, WOFOST, Overwinter, Improvement, Winter wheat