Abstract: Problems of 4 kinds of agricultural machinery，such as tractor，baler，green forage harvester and sprayer，with excessively high subsidy ratio were analyzed，and suggestions on adjustment of subsidy distribution were put forward.Through reviewing evolution history of fixed quota subsidy and fixed ratio subsidy，current problems of subsidies and their causes of agricultural machinery with excessively high subsidy ratio were analyzed，and approaches of optimizing subsidy grading mechanism were summarized.