Abstract: The indexes of soil fertility in Songnen plain were obtained by soil sampling,field survey and lab analysis.According to the actual situation in the study area,we used Delphi Model to pick up ten indexes of soil fertility evaluation.The model of soil fertility evaluation was built by utilizing Fuzzy Comprehensive Evaluation and Analytical Hierarchy Process and Weighted Sum combing Python script to realize the quantitative,automatic and modeling procedure to evaluate soil fertility.The evaluating results indicated that the comprehensive index of soil fertility ranged from 0.57 to 0.84,furthermore,the spatial distribution took on obvious banding characteristic,namely,soil fertility grades increased from southwest to northeast.Soil fertility grade was higher in Harbin city's surrounding areas but lower in Shuangcheng city.The evaluating result is consistent with local conditions.This research provides scientific basis for guiding agricultural production and establishing protective measure to farmland eco-environment.