This paper firstly clarifies the typical characteristics of aircraft complex systems

and the requirements of aircraft integration verification in product development as well as the challenges in aircraft final assembly process planning. With the help of verification and validation method from systems engineering (SE)

a unified framework of aircraft product design and process planning is produced. Then

a final assembly process planning method based on SE RFLP (Requirements-Functional-Logical-Physical) models is proposed to support the information exchange and tracking between interactions of product design and assembly processes in two ways. A case study is implemented and tested the feasibility of the proposed method in early conceptual phase of process planning.