[Aim]  To improve use of pesticides to control the tomato leaf miner, Tuta absoluta, a major invasive pest, and delay the development of pesticide resistance in this species. [Methods]  The susceptibility of populations from T. absoluta in Taigu, Ruicheng, and Yanggao counties, Shanxi Province, to seven insecticides was determined using the leaf-dip method under laboratory conditions in 2023 and 2024. The susceptibility of a laboratory, Xinjiang population of T. absoluta to different insecticides was used as the baseline of susceptibility to evaluate the possibility of resistance occurring in the three Shanxi populations. [Results]  The susceptibility test showed that, in 2023, the Taigu population was most susceptible to abamectin, followed by emamectin benzoate, cyantraniliprole, spinosad, chlorfenapyr and chlorantraniliprole, and the least susceptible to indoxacarb, with the highest LC₅₀ of 4.672 mg/L. However, in 2024 the susceptibility of the Taigu population to chlorfenapyr had decreased 2.2 times, whereas its susceptibility to emamectin benzoate and chlorantraniliprole had increased by 0.4 and 0.5 times, respectively, with little change in its susceptibility to the other insecticides. In addition, there was little difference in the susceptibility of the three Shanxi populations to four insecticides, namely, emamectin benzoate, cyantraniliprole, spinosad, and chlorfenapyr. There were, however, significant differences in the susceptibility of these three populations to chlorantraniliprole, abamectin and indoxacarb, with maximum differences of 5.6, 3.8 and 2.9 times, respectively. Based on the susceptibility of the Xinjiang laboratory population to the different insecticides, the resistance ratios of the three Shanxi populations to emamectin benzoate ranged from 17.6 to 21.7, indicating a moderate level of resistance. Resistance ratios to chlorfenapyr ranged from 6.9 to 9.8, which indicates low-level resistance, and resistance ratios to chlorantraniliprole ranged from 5.1 to 28.2, with the Yanggao population being the intermediate in terms of resistance. Resistance ratios to indoxacarb were 4.9-14.3 with the Ruicheng population being intermediate. Resistance to spinosad was at the susceptible, and decreasing susceptibility, stage (resistance ratios of 2.2-3.7). [Conclusion]  With the exception of spinosad, T. absoluta in Shanxi Province has developed low to moderate levels of resistance to emamectin benzoate, chlorantraniliprole, indoxacarb and chlorfenapyr. The results of this study provide useful information for better managing pesticide use and pesticide resistance in T. absoluta in different parts of Shanxi Province.