Improving the level of integration of aircraft design and manufacturing has become a necessary to meet the market requirement of modern aircraft and to avoid the maximum risk of technology and quality. The importance of maturity technology was emphasized and the definition of maturity was confirmed based on integrated process and digital product model(DPM) approach. Two key technologies of DPM′s maturity and milestone were proposed referring to Boeing and Airbus ideas.The management and control method of DPM′s maturity and the process of its application in integrated process were studied in detail. Associated with module product structure and the enterprise actual capability of design, manufacturing and process, the idea of multilevel maturity was established. A case of design for manufacturing process flow was given to illustrate the validity of the idea to ensure DPM integrity and to integrate process smoothly.