In order to protect environment, it is imperative to push green design.In this article, according to the concepts of green manufacturing and sustainable development, the outstanding green characteristics of hydraulics systems are expatiated, such as environment protect, saving energy and saving natural resources . Environmentally conscious manufuring (ECM) is an advanced manufacturing technology . Design for assembly and design for disassembly (DFA/DFD) of industrial products are one of the important means in this area. .At l...