The toxicity of three kinds of insecticides on the adults of Sclerodermus sichuanensis Xiao and the sublethal effects of insecticides on their reproduction were studied under laboratory conditions, and video tracking capture system (EthoVision 3.1) was employed to study the search behavior of S. sichuanensis adults. The results showed that Sclerodermus sichuanensis Xiao is the most susceptible one to acetamiprid. Lethal concentration of LC₅₀ and sublethal concentration (LC₁₀) values were 7.71 mg/L and 4.46 mg/L respectively, and it is susceptible to imidacloprid (11.22 and 6.68 mg/L) and cyhalothrin (27.72 and 9.36 mg/L) in the second place. After treated by sublethal concentration of LC₁₀ with acetamiprid, imidacloprid and cyhalothrin, the rate of successful parasitism for parental generation, F₁ and F₂ generation of S. sichuanensis was restrained. After treated with cyhalothrin, the amount of single fecundity of the parental was increased (P﹤0.05). After treated with acetamiprid and imidacloprid, there was no significant effect on the rate of reproduction of the parental (P﹥0.05), but the F₁ generation was greatly affected (P﹤0.05). After treated by sublethal concentration of LC₁₀ with acetamiprid, imidacloprid, the search behavior of S. sichuanensis were decreased. The results suggest that cyhalothrin is safe to S. sichuanensis. Acetamiprid and imidacloprid have a big effect on the reproduction and search behavior of S. sichuanensis. The results of this study can provide a scientific basis for safety evaluation of three kinds of insecticides on S. sichuanensis, rational use of insecticides and the coordination between chemical and biological prevention and control.