To control the cotton pests, the breeding of insect-resistant cotton gemplasm resource has been studied using the methods of distant hybridization, transgenic technology and morphological breeding by Shijiazhuang Academy of A griculture and Forestry Sciences since 1980 s. Four insect-resistant varieties including distant hybridization germplasm Shiyuan 321,transgenic Bt insect-resistant germplasm GK12,transgenic Bt+CpT i insect-resistant ge rmplasm SGK 321 and insect-resistant germplasm Jinmian-26 with morp...