Abstract: Based on WCSODS, the experiments of sowing date and nitrogenous fertilizer were carried out successively, and the parameters adjusted and have the wheat mode-WCSODS checked in Henan province. The results showed that:1)It was high precision for phenophase and yield between simulated data and observed, compared with the observed data, the error was 1～2 days for whole stage ,and was 4～6 days for elongation stage and 2～5 days for holding stage, for the yield, the error between simulated and observed was 4.5～20 kg/667m2;2)Based on distribution index of green leaf and dry matter above, wheat leaf area index were simulated by WCSODS, the error was avoided caused by calculation green leave area, simultaneously it also thought over the limit of leaf area index increasing for tiller number and included the wheat variety of different tiller ability ,so it had good application. The results showed that the correlation coefficient between observed and simulated data of the leaf area index、tiller number and dry matter weight was 0.9877～0.9995;3)The problem for the model-WCSODS is disregarded the effects of nitrogen intimidation on the growth of wheat.

Key words: Wheat, Simulation model, Parameter, Application