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 $LC_{50}$ 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 $LC_{50}$, respectively, and also fluvalinate was showed high resistance development. In generally, the pyrethroid insecticides were showed higher development of resistance than organophosphorus insecticides.