Abstract: Chlorantraniliprole is a newly developed insecticide targeting at lepidopteron pests in rice fields, whereas Nilaparvata lugens (St-l) is one of the important nontarget pests of the insecticide. In this paper, the rice stem dipping method was adopted to test the toxicity of chlorantraniliprole to the 3rd instar nymphs and adults of N. lugens. The LC_50 of chlorantraniliprole to the 3rd instar nymphs and adults was 26.85 and 35.53 mg·L^-1, respectively. When the 3rd instar nymph was exposed to the LC₁₀ and LC₂₅ of chlorantraniliprole, the life span of the survived female adults was not significantly affected. However, when treated with LC_25 dosage, the fecundity of the survived female adults was significantly reduced by 45.6 eggs. After the 3rd instar nymph was treated with the sublethal doses LC₁₀ and LC₂₅ of chlorantraniliprole, the fecundity of the F₁ females were decreased significantly by 43.5  and 72.9 eggs, and the life span of the F₁ females was shortened by 1.35 and 2.87 d, respectively. The developmental periods of all the instars of F₁ generation were delayed after treated with the sublethal doses LC₁₀ and LC₂₅ of chlorantraniliprole. The intrinsic rate of increase (r_m) was decreased by 12.8% and 23.5%, and the net reproductive rate (R₀) was decreased by 37.4% and 68.7%, respectively. Meanwhile, the mean generation time (T) and population doubling time (t) were delayed. Overall, the sublethal doses of chlorantraniliprole could suppress the population growth of N. lugens.