The characterization of pyrolysis behaviour of six combustibles in Municipal Solid Wastes (MSW) was carried out by using the thermal analysis method. The experimental results showed that the heating value of MSW was high. The results of thermogravimetric analysis(TGA) on different combustibles in MSW are reported. The gaseous pyrolysis products were analyzed. The combustion process of MSW can be expressed by one or two first—order reactions. Two categories of pyrolysis characteristics were classified for combustibles of MSW . Analyzing the pyrolysis products of these combustible showed that the pyrolysis of combustible of MSW produced a synthetic gas with a high calorific value. The gaseous products were mainly pyrolysis products of cellulose

CO and CO 2

and those of polymer

hydrocarbons.