The aim of this study was to investigate plant essential oils enhance the percent mortality of gravid Aedes aegypti mosquitoes. Essential oils, the methanol extract of Curcuma longa rhizome and Zingiber officinale rhizome, and non-essential oils, Garcinia mangostana pericarp were tested mortality of gravid Ae.aegypti mosquitoes. GC-MS technique was used to detect essential oil compounds in the extract. The concentrations of three extracts were 250, 500, 1000, and 2000 ppm. ar-Tumerone and Zingiberane were mainly essential oil compounds in C.longa and Z. officinale, while 2-Furancarboxaldehyde in G.mangostana. At 24 h exposure, essential oils enhanced the percent mortality of gravid Ae.aegypti mosquitoes. The extract of C.longa showed the highest toxicity among the other extract with 100 % mortality of gravid Ae.aegypti and the LC50 value of 121.36 ppm. The C.longa and Z.officinale possessed numerous essential oils could be used as plant insecticides, as alternative to synthetic insecticides.