Abstract: The farmers are the ultimate beneficiaries of Mechanized Straw Returning service(MSRS).Evaluating MSRS performance based on farmers’perspectives and the diagnosis method of obstacle indicators can provide a basis for improving MSRS performance. Here,an evaluation index was built using the economic man attribute and social human attribute of famers,and the service process stage and service results stage based on farmers’perspectives.Based on entropy weight improved TOPSIS method and obstacle degree model, through the questionnaire survey of farmers in Hebei, Shandong, Anhui and Hubei provinces, the paper evaluated the performance level and obstacle factors of Mechanized Straw Returning service performance in four provinces.The results show that the performance level of Mechanized Straw Returning service in Shandong province is”excellent”, the performance level of Hebei province is”general”, and the performance level of Hubei province and Anhui province is “poor”.The most important factor affecting the service performance of Mechanized Straw Returning is the farmers'evaluation of MSRS results stage, followed by farmers’ evaluation of the MSRS process stage;The main factors affecting the service performance level of Mechanized Straw Returning are the social development after straw returning, the situation of farmland diseases and insect pests, the evaluation of subsidy policy for straw returning,and the entropy situation of cultivated land after straw returning.Therefore, in order to improve the overall level of Mechanized Straw Returning service, strengthening propaganda and popularization of MSRS, improving the Mechanized Straw Returning subsidies and other policies and measures,improving the supporting facilities and service supply after straw returning, should be the focus of the current policy.

Key words: mechanized straw returning, service performance, obstacle degree, TOPSIS Method