Sensor aircraft and integrated wings embody the integrated design concept of integrating functional components and structures. However, there are problems with discontinuous skin force transmission and difficult connection in the wing structure, making the connection strength of functional skin a control factor in the design process. Therefore, this article combines the functional requirements and structural characteristics of the integrated wing, adopts a simplified connection calculation method, conducts force transfer analysis and connection characteristics analysis on the key sections at the separation surface of the functional skin design, obtains the ideal connection load and connection parameters at the separation surface, completes the connection design and size design, and verifies it through finite element analysis and optimization analysis. The results show that the estimated bending moment distribution of the box section using this force transfer analysis method is consistent with the finite element analysis results; The calculated size distribution of each section of the box section structure is similar to the optimization results, which can meet the requirements of connection strength and stability; The larger the effective height of the wing beam in the box section structure, the greater the load it bears, and the more consistent the optimization results with the force transfer analysis results.