[Objectives]  To determine the sensitivity of Spodoptera frugiperda in Fujian province to six insecticides recommended by the Ministry of Agriculture and Rural Affairs. [Methods]  The leaf dip method was used to determine the lethal concentration 50 (LC₅₀) of six insecticides (emamectin benzoate, spinetoram, indoxacarb, chlorantraniliprole, clorfenapyr and lufenuron) to S. frugiperda, collected in Jian’ou county of Nanping city, Yong’an county of Sangming city, Fuqing county of Fuzhou city and Changtai county of Zhangzhou city. The LC₅₀ values of these six insecticides were also compared between specimens collected in Jian’ou and Changtai populations in spring and autumn. [Results]  The susceptibility of S. frugiperda to the insecticides tested varied significantly among populations. The LC₅₀ of emamectin benzoate in the Changtai and Fuqing populations was about twice than that in the Jian'ou and Yong'an populations, and the LC₅₀ of indoxacarb in the Changtai and Fuqing populations was about 3 times than that in the Yong'an population. The susceptibility of S. frugiperda to insecticides also varied between seasons. The LC₅₀ of chlorantraniliprole and clorfenapyr to the Changtai population was 0.20 times and 2.26 times, respectively, in autumn than that in spring, and the LC₅₀ of emamectin benzoate and indoxacarb to the Jian’ou population was 4.75 times and 2.20 times, respectively, in autumn than that in spring. Rearing ten successive generations without insecticide exposure caused the LC₅₀ values of lufenuron, indoxacarb and chlorantraniliprole to decrease 8.15, 22.87 and 10.58 fold, respectively, compared to the F₁ generation. [Conclusion]  Field populations of S. frugiperda in Fujian province are generally still sensitive to the six tested insecticides in 2020. In Changtai and Jian’ou, the sensitivity of S. frugiperda to chlorantraniliprole, clorfenapyr, indoxacarb, lufenuron differed significantly between spring and autumn.