Silkworm (Bombyx mori) is a kind of important economic insect and it will be feed with artificial diet in the future.The feeding habits of most silkworm in our country cannot meet the practical demand, which is the main obstacle that prevent the promotion of the technology.Increase the feeding habits and adaptability of the silkworm to the artificial diet is an important research subject.Previous studies focused on the General genetics.But the molecular mechanism of trophic differences is unclear and the related genes havent be found.