The chemical compositions analysis and proximate analysis are carried out experimentally for seven kinds of biomass in Chongqing, corn stalk, corn cob, broomcorn stalk, rice straw, wheat straw, yellow Jue tree and bamboo. Furthermore, the thermogravimetric experimental are carried out on the pyrolysis performance of seven kinds of biomass by the thermogravimetric analyzer. The effects of biomass species, particle size, heating rate and pressure on the pyrolysis characteristics are discussed. Temperature corresponding to the maximum pyrogenation rate and the pyrolysis kinetic parameters such as activation energy, frequency factor, and so on are presented.