In order to meet the demand of hydraulic experiment teaching in universities, base on the analysis of the function of virtual hydraulic experimental system, the main research contents、 system scheme and key technology are determined. Three-dimensional model of the hydraulic components are established. Working principle of hydraulic component is displayed. The action process and the performance of the hydraulic circuit are simulated. A virtual hydraulic experimental system with its own characteristics is built. The virtual experiment system is not only suitable for classroom teaching but also suitable for the experimental teaching and learning activeness of students is enhanced by using the system.