Energy and environment have become to the two major themes in todays world.Withthe development of economy, human civilization progressed continually.On one hand,the world reserves of fossil energy has been proven to become less and less, itsdifficult to maintain sustainable development.The international energy situation istense increasingly.On the other hand, the consumption of fossil fuels has causedserious environmental problems.People are looking for substitute of coal andpetroleum.However, coal and oil and other fossil energy are not renewable energysources.And with the increasing depletion of fossil energy and the seriousenvironment problem, the development of clean renewable energy resources hasbecome a pressing task.Under this background, the biomass energy as the onlyavailable fixed carbon renewable energy, its conversion efficiency and clean use ofincreasingly attracted worldwide attention.In China, due to the large population, therelative shortage of resources, weak ecological environment capacity, the researchesof biomass energy and full use of wood fiber raw material are important to solve theproblem of energy and environment.　　 Lignin is the second natural high molecular compound in nature which only followswith cellulose in biomass.Lignin is also the only renewable compounds that canprovide aromatic.But due to the complex structure, lignin has not yet been rationaluse.The research of lignin pyrolysis at different chemical environment, such ascatalytic pyrolysis to produce some important phenolic chemicals, or pyrolysisproducts of lignin to synthesis polymeric material or solid fuel, is important to full useof this renewable resource.　　 In this research, we use industrial straw enzymatic lignin and industrial lignosulfonatein pulping black liquor as raw materials to study the thermal cracking behavior oflignin in different atmosphere and different catalysts.In the same time, thermalinfrared spectrometry and gas chromatography-mass spectrometer are used to studythe pyrolysis characteristics.　　 The results showed that the pyrolysis of lignin can be divided into three steps reaction,free hydrolysis adsorption process, initial cracking process at near 200℃ andcomplete cleavage at near 400℃.Extractions can affect the extract products, wherethe xylene, acetone and dichloromethane could extract more products.Temperaturealso affects the process of pyrolysis.With the increase of temperature, the content oflignin aromatic alcohols decreased, and aromatic aldehydes and ketones increasedfirst and then decreased.In our research, we selected Al and Cu salts as catalysts inlignin pyrolysis.In the pyrolysis process, both catalysts improved product quality.Alcatalyst was in favor of the cleavage of C-O-C ether bond in lignin and producedsmall molecular alcohols, and contributed to the inhibition of aldehyde and ketonematerial production.Cu catalysts were in favor of breaking the C-C bonds in ligninmolecule and produced small molecules of aromatic esters.The results from solventexperiments show that solvent could increase the lignin pyrolysis products comparedwith the no solvent situation.Results from gas production showed under Al catalysisgas proportion increased with the increase of catalyst amount, while under Cu catalystthe gas proportion decreased with the increase of catalyst amount.