Different species of mosquitoes are subjected to control by synthetic organic insecticides, particularly organophohate (OP) and carbamate insecticides in different localities in the world. These insecticides inhibit the acetylcholinesterase (AChE) in the central nervous system leading to toxic conditions. However, within years various strains of mosquitoes developed resistance to these insecticides. In an attempt to update the mechanism of adaptation profile between the mosquito's AChE, and OP and carbamate insecticides, the present critical review, with special emphasis on some alterations associated with genetic changes in AChE has been provided.