An unmanned aerial vehicle (UAV) is an aircraft without a pilot which performs a mission by being remotely controlled via ground control system. Since military UAVs require rapid deployment depending on the operational area, the ground control system is mounted on the ground control vehicle for mobility. In addition, a ground relay station is installed in the vehicle to secure the data-link communication as well. In this study, the damaged power t ransmission belt of the power generator for ground relay station is analyzed to establish a countermeasure for extending the life of the transmission belt and confirm the result of applying the improvement solution. As a result of the analysis, the causes of damage are identified as belt alignment, excessive tension of the belt, and contact between belts in the engine room. As solutions to such problems, applying the belt alignment measurement procedure and adding a spacer for alignment adjustment are proposed. In addition, the engine room interface is improved by optimizing the position of belt auto-tensioner for strain relief and reduction of contact between the belts. Thus, it is expected that the study can contribute to securing the safety of UAV operation and improving performance efficiency.