Abstract: Using the silkworm parent species as material,young silkworm rearing on artificial diet and their descendants were fed with the same diet.The growth and development of silkworms,mass fraction of the protein of the eggs,the activities of CAT and SOD of eggs,were measured,respectively.The results showed that:(1)932 and Furong were selected through three generations, and their setal dispersion rates increased from 14.6% and 9.4% to 52.4% and 53.8%,respectively,and the survival rates increased from 20.5%,19.2% to 38.2%,32.0%,respectively.But the selection effect of Xianghui and 7532 was not changed significantly;(2)Mass fraction of the egg protein of Xianghui and 7532 fed by diet was lower than those fed with mulberry leaves.While the mass fraction of egg protein of third generations of 932 and Furong were maintained 52.50-55.00 and 41.50-52.50 mg/g,respectively,which were consistent with those fed with mulberry leaves;(3)The activities of CAT and SOD of different eggs were related to the varieties and diets.The activities of CAT and SOD of eggs from four varieties fed by diet were higher than those fed with mulberry leaves.