As there are many drawbacks exist in the traditional design process,it's important to reduce the circle of the product design.The article relys on the SML,which describes standardization and regularization information of product.According to the method of product development and design system for MC,making the CAD system SolidWorks as application tool,pricple and core technology of variant design based on SML are analyzed.Throgh the second development,the product's variant design is implemented.Finally,an application example is given to verify the feasibility of method.Additionally,the procedure of agile design system is given.