The present invention relates to an aqueous pest control composition consisting of: a) 0.01 to 2% by weight of a pyrethroid compound； b) 1 to 40% by weight of polypropylene glycol monopropyl ether which is at least one selected from the group consisting of dipropylene glycol monopropyl ether and tripropylene glycol monopropyl ether； c) 5 to 40% by weight of a water-soluble organic solvent which is at least one selected from the group consisting of glycol monoalkyl ether having 7 or less carbon atoms and glycol having 9 or less carbon atoms； d) 20 to 80% by weight of water； and e) 5% by weight or less of a formulation additive.本發明關於水性害蟲防制組成物，其係由下列者所組成：a)0.01至2重量%之擬除蟲菊酯(pyrethroid)化合物；b)1至40重量%之聚丙二醇單丙醚，其至少為一種選自由下列所組成之群組的聚丙二醇單丙醚：二丙二醇單丙醚及三丙二醇單丙醚；c)5至40重量%之水溶性有機溶劑，其至少為一種選自由下列所組成之群組的水溶性有機溶劑：具有7個或更少個碳原子之二醇單烷基醚及具有9個或更少個碳原子之二醇；d)20至80重量%之水；及e)5重量%或更少之調合物添加劑。
