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(The traditional development method based on documents has been become more and more difficult to meet the complex launch vehicle energy system’s need. Practice proves that widely used model-based system engineering (MBSE) approach-Harmony system engineering method is relatively complex, and has high requirements for system designers, which brings certain difficulties to engineering. Therefore, this paper proposes the Architecture Analysis and Design Integrated Approach (ARCADIA) to address the development and design of the launch vehicle energy system. Taking into consideration of launch vehicle development and design process and characteristics, system, logical and physical architecture model are built respectively using the iterative and refined features of this method. ARCADIA MBSE method provides an unambiguous and precise model of energy system and ensures its consistency, correctness and completeness. In comparison of Harmony system engineering method, the ARCADIA MBSE method is not only more in line with design habits, but more convenient for designers to understand and design. And hence it further improves the system design efficiency. This ARCADIA MBSE development and design procedure could be applied for avionics, which establishes the foundation of further utilization.)