Abstract: Taking the virtual technology as core, the software SolidWorks is redeveloped via Visual BASIC to implement the virtual design of integrated hydraulic manifold blocks, thus solving the laborious, time-consuming and error-prone problem to design the orifice network. The system architecture given, the ways to digitize the hydraulic function diagram and design/check the integrated blocks are proposed. By setting up a characteristic library, a SolidWorks-based 3D parameterized modeling is implemented using ActiveX Automation technique. Then, the virtual design approach is applied to forming a mode for such a design and a scheme to provide relevant environment so as to adapt to the characteristics of integrated hydraulic manifold blocks and CAD requirements. Moreover, the ways to solve the problems in virtual design are presented including interferometric check during assembling the blocks to make the design more successful.