Abstract:Biotechnology represented by genetic engineering has been progressing at amazing speed since 1980's.In USA,over 40 different transgenic crops were tested in field,including the main cereal grain(e.g.wheat,rice and corn et al .),fiber crop(e.g.cotton),ve getables(e.g.broccoli,potato and tomato et al. )fruits(e.g.apple,grape and watermelon et al. ),oil crops,forages and flowers.18 kinds of products of trangenic crops incorporated genetic materials with different traits,such as corn,cotton,soybean ...