Natural resource valuation method for model design for sustainable develonment of agriculture

Through evaluation the sustainability of natural resources expressed by theireconomic value,it is helpful to chang the free using natural resources to non-gratuitous system in order to sustain the productivity of the natural resources.Method and theory for evaluation the ecomonic-value of the natural resources were analysed in the paper,and date collected from a pilot field in Baiquan County was analysed and calculated by a method called Natural Resource Depreciation.The results proved the effectiveness of the method.