Abstract:In order to compare the development and reproduction between Frankliniella occidentalis and Thrips tabaci, the laboratory population life tables were studied on purple cabbage at 25℃. The results showed that the immature period of F.occidentalis was significantly shorter than that of T.tabaci. In F.occidentalis population, average lifespan of female adult was 32.06 days and could lay 125.19 eggs when it played gamogenesis, but when the female F.occidentalis played parthenogenesis, it‘s average lifespan was 43.33 days and could lay 246.40 eggs. The female lifespan of T.tabaci was only 23.44 days, but could lay 186.06 eggs all it‘s life. The intrinsic rate of natural increase of F.occidentalis (0.1543) was lower than that of T.tabaci (0.1872). The trend index of population of F.occidentalis was 72.2456, and T.tabaci was 126.2272. The rate of immaturity numbers in the age structure of F.occidentalis on the purple cabbage is lower than that of T.tabaci, but the maturity numbers of the former were higher than that of the latter.