Abstract: The oil-smoke generators used to control forest diseases and Pests are made up of the main pesticide(deltamethrin, cypermethrin and chlorothatonil), solvent(0~#, 100~# and 1210~# ) and certain amount of an auxiliary agent. Their physical and chemical properties agree with the requirements of technical qualities. Acute toxicity on the albino rat shows that the oil-smoke generator of deltamethrin is of micro-toxicity, while oil-smoke generator of chlorothalonil is of low toxicity, which satisfies the requirement for practical application.