Abstract: Resistance identification of cotton veriety to insects is one of the important parts in cotton variety trial. Cotton bollworm and pink bollworm are the main components of insect-resistant identification procedures in the regional cotton variety trial. Netted cage identification is a basic method；The insect densities for pink bollworm are 5 pairs of mature male and female insects and 2 pairs for cotton bollworm in average of per 10 squire meters within the netted space. The standard used for plant resistance to pink bollworm is the percentage of damaged seeds, and the criterion for resistance to cotton bollworm is settled as the percentages of damaged plant growth points, flower buds, open flowers, and cotton bolls. Based on these, the resistance of varieties under trial are graded as immunized (I), high resistance(HR),resistance(R),middle resistance(MR),insect sensitive(S) and highly insect sensitive(HS).