Abstract: Agriculture is the pillar industry of national economy development.The competitiveness of agricultural economy was the comprehensive ability of agricultural economic development.Based on the data of 2017,the evaluation index system of agricultural economic competitiveness in Heilongjiang Province was constructed,three objective weighting methods were used to improve the combined weighting model of maximizing the grade difference.The degree of agricultural economic competitiveness of 13 prefectures and cities in Heilongjiang Province was comprehensively evaluated and sorted,the differences of the evaluated objects were opened to the maximum extent,and the rationality of the ranking of various evaluation results was guaranteed through the combined weight.Based on the comprehensive evaluation results,the countermeasures and suggestions to improve the competitiveness of agricultural economy in Heilongjiang Province were given.