Equivalent Conversion Method on Relative Ecological Value

In order to overcome the deficiencies of different subjects，especially applied function coefficient between different research areas or evaluation by scoring in assessment of ecosystem function in the past.A method of equivalent conversion of ecological function value was proposed，and made practical use by an example of the evaluation function of farmland to forest and barren enclosure in Xinxiang forever of Jingyuan County of Gansu Province.Results showed that，ecological value of woodland by conversion of cropland to forest was greater than the total value with ecological value of crops and agricultural output in the locality.The method not only overcome the shortcomings of described above，but also achieve comparability of different ecological functions and crop production value in the ecological function evaluation.This method could be used to evaluate ecological value different ecological measures，especially for the value assessment of returning farmland to forest and public welfare.