In the hydraulic system hydraulic components is its main parts, hydraulic components manufacturing cost and efficiency in the hydraulic system has and important role. And the wide application of CAD machinery industry has an important influence on the. The current CAD application situation, still save the following two questions: first, CAD slow work, results scattered, difficult to play advantage. As CAD platform for secondary development work is few, the software development level is not high also, targeted too strong, the application is extremely limited. Second, the existing most CAD software in the user interface has interactive difficulties, the inconvenience of operation, which has greatly restricted the popularization and application of CAD technology. This paper in Autocad second development platform on, through the use of Visual Basic for Application of hydraulic language integrated blocks ?