Two classes of insect resistant varieties and four groups of traditionally bred varieties were investigated in their economic and agronomic characters, early maturity and pink bollworm resistibility in the years of 2002 and 2003. The tests were arranged in accordance to the design of randomly grouped plots and three times repeats. The identification of pink bollworm resistance was carried out in caged plots. The results showed that the insect resistant varieties, especially the insect resistant hybrids, expressed a better cotton productivity and produced a higher yield under the condition of 70% of reduced chemical prevention and control of the pests compared with those of the ordinary cotton growing field. The percentages of the yield increments reached extreme significant levels statistically. A conclusion was made that breeding out and popularizing the insect resistant cotton varieties had a broader future, as these varieties had a higher fiber quality, stronger insect resistibility and earlier maturation character.