Abstract: Based on environmental impact and resource consumption, a comprehensive evaluation model for life cycle of direct combustion power generation system of pruned apple tree branches was established and analyzed．Results showed that comprehensive performance index of direct combustion power generation of pruned apple tree branches ranged from 0.055 to 0.225(person·year)/(10000 kW·h), and effect of environmental impact on comprehensive performance was much greater than that of resource consumption, and characteristics were local > equal > regional > global．The maximum value of direct combustion power generation of pruned apple tree branches was only 57.25% of the minimum value of coal-fired power generation, showing a good advantage．Comprehensive performance of direct combustion power generation of pruned apple tree branches was most sensitive to total amount of solid waste and raw material consumption rate．Therefore, effective management and disposal of solid waste, as well as improvement of quality of biomass boilers and fuels, can further improve environmental benefits of direct combustion power generation of pruned apple tree branches．Results of this study could provide theoretical basis and reference data for research of direct combustion power generation system based on pruned fruit tree branches．