The electronic equipment additionally installed on the aircraft is difficult to secure structural stability for the operating environment due to the limitation of installation location. In this paper, the improvement method of the installation structure of the electronic equipment was studied in order to secure the structural stability of the additional installed electronic equipment. First, we analyzed the problems of the existing installation structure and derived two improvement methods. Then, the static and dynamic analysis were performed to compare and analyze the improvement effect of the two methods and to select the optimal improvement method. After that, flight tests were conducted on the aircraft to which the improvement method was applied to verify the improvement effect of the installation structure.