The indoor poisonous effects of six insecticides, namely kang-kuan, deltamethrin, fenpropathrin, beta-cypermethrin, avermectins and dipterex, on the 3^th larva of Ephestia elutella (Hübner) were studied by means of micro-spray. The result indicated that the poisonous effect of kang-kuan was the best insecticide, and the mortality rate of larva with post-treatment for 8 days was 96.67% after treated with 4000 times diluent of kang-kuan deflocculant of 200 g?L^-1, and none of the larva pupated in the end. The dipterex had good poisonous effect on the tested larva as well, and the mortality rate of the larva was 83.33% after treated with 1000 times diluent of 90% content of dipterex crystalloid, which was markedly higher than those of deltamethrin, fenpropathrin and beta-cypermethrin. As an excellent protectant for stored tobacco, the insecticide kang-kuan should be widely applied into the control of E. elutella larva.