Effects of the moisture content and the chemical nature of solid wastes on their methane production in landfill were investigated using a solid bed incubated at 41°C. The solid-beds were filled with different moisture contents of meat, cabbage, sewage sludge cake, carrot, rice and potato. A simple model contained methane production potential, P, maximum methane production rate, R_m, and lagphase time, λ, was developed to fit the cumulative methane production curve in the batch experiment; and all the parameters in the model for various solid beds were estimated. For each proper solid waste, the lagphase time decreased, but the methanogenic activity increased with the increase of moisture content. The results reflect that the moisture content threshold limit (MS_L) for the methane production in the solid bed was about 60%.