Abstract: Production of biogas by anaerobic fermentation means to turn organic waste into treasure，which can achieve the purpose of reduction，harmless and resource utilization，and finally reduce waste of resources and ecological damage.The primary index of evaluation system was constructed from characteristics of biomass，reaction conditions and other factors.The total solid concentration，C/N，reaction temperature，pH value and exogenous additives were selected as the secondary indexes.The weight of each secondary index was determined by combination method of AHP and entropy weight.Optimization model of anaerobic fermentation parameters based on ELECTRE-1 method was established，and process parameters of biogas fermentation were optimized，which provided a theoretical basis for scientific control of biogas fermentation process parameters.