Abstract:The technical risk (Rt) management is dynamically fulfilled throughout and matched with the development process, from the upper layers to lower ones.The Rt is defined in the view of analyzing and controling it during the product development.Two dimension model of Rt is put forward which consists of Rprd (technical risk of product) and Rprs (technical risk of process).Hereby the technical risk management system of complex product development is set up.There are identification and assessment of Rt, risk planning,tracking and controlling on function layer,Rt management is processed on system,subsystem,manufacturing level on process layer.Rt management system is applied to the development of lithgraphy machine.