After the analysis of the effects of different packaging films on the changes of gas content,three groups of initial O2 and CO2 ratio were chosen for the preservation of white Hypsizygus marmoreus,and the effects of these groups on several quality indexes of white Hypsizygus marmoreus were studied.The air package was used as control.The results indicated that the white Hypsizygus marmoreus was sensitive to CO2,higher content of CO2 would speed the browning degree.When the initial O2 and CO2 ratio was O2 0.4%+CO2 13.0%+N2 86.6%,the sensory index and rigidity could be well maintained;the respiration rate and the activity of PPO could be significantly depressed;the gas composition of low O2 and high CO2 could be achieved.The losses of total soluble sugar reduced and the shelf-life was prolonged to more than 7d.This indicated that MAP is a better storage method.