For a long time

in the procedure of designing instruments

the design of structures and modeling often lags behind the design of function. It is the bottleneck in cutting down the design periods because the data of structures come from the function design and the process of design usually repeats again and again. The paper proposes a method which can make the design easily and freely and cut down the design period

by which the designers could design the structures in virtual spaces to get the details about the original model. Using OpenGL (Open Graphic Library) and MFC( Microsoft Foundation Class)

the authors present a 3D instrument virtual design system to complete the structures'design and revision. The system can create a virtual 3D space where the design of structure will be finished. Therefore

the designers can check the availability of instrument design.