In order to meet the requirements of digital and flexible manufacturing of aircraft panel

this paper proposes a flexible assembly method of aircraft panel based on inner surface of skin positioning. Through the application of finite element parametric modeling and the optimization algorithm of skin support points

the optimization design of fixture board layout is realized. According to the positioning requirements of each part of the panel component

the flexible positioning method of stringer

skin and shear clip in the flexible assembly system was designed in detail

and the distributed network control system based on EtherCAT fieldbus technology was developed to complete the panel assembly. Through the application of this system

the assembly of four panels can be completed on one flexible tooling

which changes the traditional design approach and is of great significance to the development of aircraft panel flexible assembly technology