Design of forging dies is tedious, tedious and complex process, which is a skill-based activity, and it needs more effort and time,  the specialists in the design of the collection of knowledge - forging dies of knowledge and expertise are necessary for the design process. The aim of the present work is to study Computer Aided design of Connecting rod. This is done by analyzing the elements of design and knowledge experience, establishing knowledge bases, using Visual Basic to link knowledge bases and Solid Works. This system is experimental. The results indicate that the benefits of using this system to save time and effort and reduce errors caused by designers and improving the design quality.