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A study was conducted to determine the susceptibility of Anopheles sinensis larvae, malaria vector, from Paju-shi (Gyonggi-do) to 24 pesticides including 11 pyrethroids, 11 organophosphates, 1 pyrazole analogue and another pesticide. The mosquito larvae showed the most highly susceptible to chlorfenapyr with LC50 of 0.0063 ppm followed by spinosad, temephos, fenthion and beta-cyfluthrin with 0.03, 0.0366, 0.0367 and 0.0998 ppm, respectively, and fluvalinate (¤128 ppm) was the least susceptible. Also, 11 pesticides of them were compared with Goyang strain (Gyonggi-do) of data 1992. The development of resistance was noticed to cypermethrin and permethrin as much of 73.59 and 6.23 folds at LC50, respectively, and also fluvalinate was showed high resistance development. In generally, the pyrethroid insecticides were showed higher development of resistance than organophosphorus insecticides.