Abstract：Crop growth simulation models are widely applied in crop growth monitoring and yield forecasting. In order to identify the key parameters of crop model and reduce the non-applicability of the model simulation, the winter wheat of Gaocheng was selected as a case. The extend fourier amplitude sensitivity test was employed to analyze the sensitivity of WOFOST model parameters. The result shows that six parameters have high sensitivity with values were greater than 0. 1. They are the specific leaf area at 0. 5 and 1. 0 growth stages, the accumulated temperature from seedling to flowering stage, the growth cycle of leaf area at 35 ℃, the correction factor of effective light energy utilization at 20 ℃ and the maximum CO2 assimilation rate at 30 ℃. It also indicated that the contribution of the parameters to the yield formation was large. The research demonstrated that EFAST method has significant value in guiding model modification and can also provide an important basis for the localization of model parameters.

Keyword：sensitivity analysis;extend fourier amplitude sensitivity test;WOFOST model;crop parameters;