In order to investigate the effect of pupa peptide powder and maggot powder on the growth performance, body composition and digestive enzyme activities of juvenile mud crab (Scylla pseudoaculea), the basic diet was supplemented with 10% pupa peptide powder and maggot powder to feed the juvenile mud crab for 45 days. The results showed that:Weight gain and specific growth rate of the juvenile mud crab in pupa peptide diet group were significantly higher than those in basic diet group and maggot diet group, whereas survival rate of the juvenile mud crab in pupa peptide diet group was significantly higher than those in basic diet group; Water content of the juvenile mud crab in basic diet group was significantly lower than that in pupa peptide diet group and maggot diet group, whereas crude protein content of the juvenile mud crab showed the opposite result, crude lipid content of the juvenile mud crab was basic diet group>maggot diet group>pupa peptide diet group,protease and amylase activity of the juvenile mud crab was basic diet group