Abstract: Virtual design, is three-dimensional modeling and virtual assembly of products by using computer technology, is one of the advanced design technologies in the design field. It has many advantages such as improving the product design quality, shortening development cycle, and reducing development cost. In this paper, taking the SolidWorks software as the platform and the directional valve as an example, the methods and skills for three-dimensional modeling of the complex parts are discussed in detail, as well as the common problems and solutions in virtual assembly. It has high reference value for the product design developers.