Abstract: During the period of Sep. 1, 1984 to Jul. 2, 1994, field experiments were conducted at Changwu Agricultural Ecosystem Station in Loess Plateau to measure water and energy balance components, crop growth and yield of winter wheat. A process-based model (WAVES which was developed by the CSIRO, Land and Water Division of Australia) was tested using the measurements. Comparison of the measured data during one year and ten years with the predicted results is agreeable. These data including LAI of winter wheat and its dynamic change, water content in soil profile and its variation with time. So WAVES can be used to model hydrologic processes of agricultural ecosystem in Loess Plateau and to evaluate effects improving water use efficiency by fertilization and mulching. At last we also point out the shortcoming of WAVES and revising fields needed.