Now he is a professor in the Department of Chemistry of Hebei University. Mainly engaged in the synthesis of biomarkers, and has completed the synthesis of more than 50 biomarkers in five series, including 4- methyl sterane, cracked sterane, lupane, norlupane, long-chain alkyl-1 and 3- diol. The structures of bis-norcamphene and long-chain alkyl-1, 3- diol were identified for the first time, which greatly improved the separation method of olefin compounds by silver nitrate silica gel. Firstly, the thermal decomposition reaction of stable ozonates and the ozonation of oximes to carbonyl compounds were discovered, and seven bicyclic sesquiterpenes were synthesized completely. He has participated in and presided over the National Natural Science Foundation and many provincial and ministerial projects, published 47 papers, and was included and cited by SCI for more than 40 times. Won the third prize of scientific and technological progress in Gansu province 1992. Comrade Li Tongshuang works hard, studies rigorously, has a decent style of study, and has good professional ethics, professionalism and strong pioneering ability.