Abstract:Fresh yak meat has a good quality and is popular among consumers，but it is easy to deteriorate during routine chilled storage，which causes the quality of yak meat to decrease or even be inedible.To prolong the storage period of chilled yak meat and improve its eating quality during the cold storage process，fresh yak meat was stored in the air-conditioning assisted refrigeration method. By comparing the weight loss rate，pH value，volatile base nitrogen content，total colony of fresh yak meat in different combinations of O2，N2 and CO2，it was found that when the volume ratio of O2，N2 and CO2 was 15∶75∶10，the quality of yak meat with modified atmosphere preservation was superior. Under the gas combination，fresh yak meat could maintain good quality after storage for 7 days at 0 ℃-4 ℃，and the quality of yak meat continued to decrease after 7 d-18 d of storage.After 25 days of storage，yak meat was not edible. In short，the modified atmosphere could better prolong the quality of refrigerated fresh yak meat.