Abstract: Seven transgenic strains of insect-resistance cotton,WH₁,WH₂,WH₃,WH₄,WH₅,WH₆ and BG₂,and one common strain Simian-3 (CK) were selected to investigate their adaptation to insect-resistance and yield trait at 10 different sites.The results show that all transgenic strains had a strong resistance to bollworm(Helicoverpa armigera) and pink bollworm (Pectinophora gossypiella),with a high stability and no difference in 10 sites,but the yield trait was significantly influenced by environmental factors.The interaction between strains and sites was significant. In comparison with CK,WH₆ and BG₂ had a good insect resistance and high fiber yield,and could be applied in practice.

Key words: Transgene, Insect-resistance, Adaptation, Cotton