Abstract DFX (design for X )are im portant tolls to m ake product concurrent design,considering the disassem bly and assem bly in m aintenance activities,the necessity of researching on DFA.DFD oriented for maintenance is put forward.After reviewing related work of DFA DFD,the system function,construction and key technologies are described. A s a design tool,the system has been verified for its feasibility to m ake m aintainabi1itv concurrent design.