Using Leucine and 2,5- hexanedione via Paal-Knorr reaction to form N-(2,5-Dimethyl Pyrrole)-leucine. Then by using DCC as dehydration reagent, DMAP as catalyst, the pyrrole acid derivatives were esterified with different hydroxyl compounds to give new pyrrole esters. The structures of all the compounds were confirmed by IR, 1H NMR, 13C NMR, HRMS spectral analysis. The thermal cracking behavior of pyrrole ester was respectively studied at 300℃、600℃ and 900℃, and 50 kinds of thermolytic products containing various aromas were authenticated which can improve the tobacco’s taste and flavor.