Municipal solid waste(MSW) produce plenty of leachate in the process of landfill after hydrolysis and degradation,which leads to the moisture content of the MSW along the depth direction very different. Most of the MSW is below the liquid level of leachate,which makes the degradation rules complicated. The samples from Wu Xi Tao hua shan Landfill were crushed by scissors and mixed, and the water content was carried out by using leachate,leachate (pH=7.45) and water(pH=7.45). The changing external temperature was simulated by adjusting the water tank in the apparatus,and he temperature of the tank water was monitored to keep 41℃ during this degradation test. The following conclusions were drawn:Under the same moisture content,the first peak of gas generation rate, the start time of secondary gas production and LFG cumulative volume have the same rule,which is specimen with leachate > specimen with leachate (pH=7.45) > specimen with water(pH=7.45),and correlated with leachate (water) rate.