Cellulase activities in animal waste composting were studied at high temperatures. Adding microbial agents increased compost temperature and cellulase activities. Peak cellulase activities were higher and occurred earlier with added microbes compared to without. Cow manure had the highest cellulase activity, followed by chicken and pig manure. The relationship between compost temperature and cellulase activities was significant when temperature was below 60℃. Above 60℃, microbial activities were affected, impacting cellulase activities.