Abstract: In order to study the sublethal effect of pyridaben on Acaphyllatheae Watt population, leaf disc feeding was conducted indoor, the effect of sublethal dose of pyridaben on the growth and reproduction of Acaphyllatheae Watt populations (F0 and F1) were studied by life table analysis. The results showed that the egg amounts of F0 female adults treated by pyridaben at three sublethal dosages (LC50, LC20 and LC10) were increased by 56.35% , 48.74% and 38.61% , respectively, while there was little effect on the longevity, oviposition duration and female to male sex ratio; the egg stage, larval stage and adult stages had no significant difference compared with that of CK (P>0.05), but adult female longevity was shorter than that of CK; the oviposition duration and egg amount of F1 generation were significantly lower than that of CK, while female to male sex ratio was higher than that of CK significantly (P<0.05); the intrinsic increase rate (rm) , net reproductive rate (R0) an d the mean generation time (T) of F1 were all shorter than that of CK, but population doubling time (Dt) was higher than that of CK, finite increase rate (λ) had no difference from that of CK. The results indicated that the treatment with sublethal doses of pyridaben had no stimulating effect on reproduction and it could reduce the development rate of Acaphyllatheae Watt.