Aiming at problems that the teaching of theory is too abstract,video displaying is too simple and lacking of interactive link,and physical demonstration teaching equipment cost is too high,.existing in the process of teaching of flowmeter,we design a flowmeter 3D simulation teaching system.In the design of the system,we make the ultrasonic flowmeter of π type pipe sections to be the research object. Firstly,we use the modeling tools of 3DMAX to make the 3D modeling of it.Then we import the modelings that it is disposed by applying colors to a drawing into Unity3D machine software.Next, we make the lower computer system that can control the displaying of teaching. Finally,let’s the lower computer system to communicate with the PC system.And this system realize the function of the 3 D dynamic displaying of ultrasonic flowmeter and the interactive teaching simulation.This system makes full use of 3D modeling technology of virtual reality technology and the advantage of 3D interaction techniques,bring the sense of reality to teaching, enhancing the students' enthusiasm for learning,improving the learning efficiency of students,shortening the training cycle,and educing the teaching cost.