Abstract: Different battery arrangement for large aspect ratio solar-powered aircraft propulsion system can affect the natural frequency and vibration response of wing structure. Large vibration response will affect the safety of aircraft. Firstly, three-dimensional model of the wing is established and the theory is analyzed. Then finite element analysis is performed. The study shows that the results of theoretical analysis are consistent with the results of finite element analysis. Battery position has significant influence on the first order torsional frequency of wing structure, and a more forward battery leads to smaller vibration response. The study results can be used as a basic reference of battery arrangement.