Abstract: To investigate the efficacy of composite microbial fermentative preparations in accelerating the composting process of sheep manure to improve the quality of compost in Gansu province, an experiment with four groups was set up, including the control group（without inoculants）, group 1（inoculated with organic fertilizer fermentative preparation 1）, group 2（with organic fertilizer fermentative preparation 2）, and group 3（with organic fertilizer fermentative preparation 3）. The composting experiment was conducted for 28 d at a sheep farm in Lanzhou. The temperature, pH value, moisture content, E4/E6 ratio, and seed germination index of the compost in 4 groups were measured at various stages during the fermentation process to examine the effects of different composite microbial fermentative preparations on the maturation of sheep manure compost in winter. The results showed that the temperature in group 1 was higher than the other three groups throughout the composting process, the control group showing the lowest temperature. The pH values of the compost in 3 experimental groups were higher than that of the control group and were more alkaline. The moisture content of the compost in 4 groups were stable between 40% to 60%, meeting composting standards. The E4/E6 values in group 1, group 2, group 3 and the control group were 1.80, 1.89, 2.19, and 1.86, respectively. The seed germination indexes of the compost in 3 experimental groups and the control group were below 50%, indicating that the compost was not fully matured. It could be deduced that the fermentative preparation 1 performed the best in accelerating the increase in temperature and enhancing the degree of compost maturity.