Optimization design could combine the modern design theory with the design work which is tested by long practice. On the condition of ensuring the products reaching some performance target and filling the stated condition of restriction

and via changing some design variables which can be allowed to change

the performance and guide line of the production could achieve the expected value of the needs. It is very important to comprehensively apply topology method and dimension optimization in innovation design of the product structure

and it can be propitious to exert the innovation ability of the designer

at the same time

it should be enhance the market competition ability of manufactures

so much as reacting the design process of the products.