The development of digestive tube and organs in sturgeon Acipenser schrencki Brandt larvae were studied by using light microscopes, and the activities of three digestive enzyme were determined by using biochemistry method.The result showed that activities of the three enzymes were increased with the development of digestive tube and organs,and with the development of different tissues and organs, the change of various enzyme activities had its own features. Moreover, the activites of three enzymes appeared in the sequence of protease,amylase,lipase,respectively.