Abstract: The application of complex microbial inoculants in the high-temperature and aeration composting sewage sludge was studied.The results show that the efficiencies of the complex microbial inoculants are not significiant for the reduction of the time for reaching the high-temperature period,the increase of the numbers of bacteria,fungi and actinomyces in a composting process of sewage sludge.But the sustained time of high-temperature is longer by inoculating the complex microbials,and the decomposition can be reached 3 days ahead of time.