In the textbook of Shanghai Education Edition, the oxygen used in the oxygen property experiment is collected bottle by bottle, bottle by bottle. The operation is troublesome, the phenomenon is not obvious, and the oxygen is easy to be lost when heated, resulting in waste. The author designed a device that can store oxygen by using three-way pipe and balloon, and used "oxygen flow" to complete the comparative experiment of the reaction between substance and air and oxygen. The phenomenon is obvious, the medicine is saved and the operability is strong.