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Objective:To investigate the susceptibility to temephos, permethrin and deltamethrin ofAedes aegypti(Ae. aegypti), collected from areas with high incidence of dengue hemorrhagic fever cases inPhitsanulokProvince,Thailand.Methods:TheF1 progenies ofAe. aegypti colony, originated from five sub-districts includingAranyik,HuaRo,NaiMuang,BanKrang andThaPho, were used in the bioassays following the procedures ofWorldHealthOrganization.For larval bioassay, the late third or early fourth-instar larvae were tested with different concentrations of temephos. For adult bioassay, the females were exposed to0.75% permethrin or0.05% deltamethrin.LC50 value and mortality rate were analyzed to compare the insecticide susceptibility of the larvae and the adults in each area, respectively. Results:TheLC50 value of temephos for the larvae from Aranyik,HuaRo,NaiMuang,BanKrang andThaPho sub-districts was0.017,0.017,0.026,0.061, and0.113 ppm, respectively.For permethrin, the highest mortality rate(86.84%) was found in the mosquitoes fromAranyik but the others were more resistant with the lower mortality rates(16.00-42.67%).The adult mortality rates after exposing to deltamethrin were higher(82.34-98.67%) in all areas.Conclusions:Ae. aegypti larvae were still susceptible to temephos.Conversely, most tested adults tended to resist the permethrin and deltamethrin.