Abstract: Abamectin is one of the most popular pesticide and acaricide. In this study, the sublethal effects of abamectin on the biological performance of the predator mites, Neoseiulus fallacis (Garman), was assessed in laboratory conditions by the life table. The female adults of N. fallacis were exposed to the sublethal concentration abamectin (LC₃₀, LC₂₀ and LC₁₀), fecundity per female were 29.11, 34.25 and 45.81, and fecundity per female per day of N. fallacis were 0.73, 0.99 and 1.50. Fecundity per female of LC₂₀ and LC₃₀ were significantly different with CK (53.89), fecundity per female per day of all the three treatments was significantly different with CK (2.43), but the sex ratio of offspring was not affected by the abamectin. In treatment by abamectin, pre-oviposition period of the next generation was longer, oviposition and post-oviposition period was shorter than the control, but female longevity was not different from the control. With treatment by abamectin, the net reproductive rate (R₀) and intrinsic rate of increase (r_m) were declined, mean generation time (T) and doubling time (Dt) were increased. Analysis showed that the survival time of nearly 40% individuals treated by LC₁₀ and LC₃₀ were longer than CK, and the life expectancy of offspring treated by LC₁₀ and LC₃₀ were significantly higher than CK. In conclusion, the sublethal concentration of abamectin was adverse to the fecundity of N. fallacis, but there was no significant effect to the development of N. fallacis.