Abstract: The study aims to improve the composting of slaughtered waste by adding exogenous microorganisms. In this study, the compost raw materials were obtained by adding Bacillus smithii with the concentration of 0%, 5%, 10%, 15% and 20% to the dried slaughtering waste. The raw materials were placed at 60, 65 and 70℃ with ventilation and constantly stirring, the water content, pH value, electrical conductivity (EC), total carbon content, total nitrogen content, carbon and nitrogen ratio and germination index (GI) were measured after 10 hours of composting. The results showed that the water content decreased at 60℃ and increased at 65℃ and 70℃ with the increase of bacteria concentration. EC value increased with the increase of bacteria concentration at different temperatures, the minimum reached 3.76 mS/cm and the maximum was 5.31 mS/cm. The total carbon content increased at 60℃ and 70℃ with the increase of bacteria concentration, and decreased at 65℃ with the increase of bacteria concentration. The pH value and total nitrogen content were affected by temperature rather than bacteria concentration. The ratio of carbon to nitrogen was influenced by temperature and bacterial concentration, and the variation range was 14- 17. The germination index increased with the increase of bacteria concentration at 60℃ and 70℃, but decreased at 65℃. The above results showed that Bacillus smithii could promote the compost maturity of slaughtered waste, and the study provides a theoretical basis for the comprehensive utilization of slaughtering waste.