Volume and unit of volume is an important concept teaching in the fifth grade of Qingdao Edition, a standard experimental textbook for compulsory education. He is a great development and leap of students' space concept. This content is abstract and difficult to understand. Based on the students' existing knowledge base and cognitive thinking characteristics, I pay great attention to the combination of teaching material content and life practice, hands-on operation and experimental observation, and strive to cultivate students' ability to solve practical problems and innovative spirit with mathematical consciousness.