Previous studies have shown that baseline pulmonary function in patients with type 2 diabetes mellitus (T2DM) is approximately 8% to 10% lower than in healthy individuals. Under similar infection conditions, respiratory function impairment is more pronounced in T2DM patients. Therefore, this project aims to explore the effects of incentive spirometry (IS) respiratory training combined with an essential oil diffusion device on improving respiratory function in T2DM patients. Over next two years, this study will utilize data from medical history, blood examination, cardiopulmonary endurance evaluations, subjective respiratory symptom assessments, and pulmonary function analyses to demonstrate the improving effect of the intervention in the patients with T2DM and pulmonary infection. In the first year, the study will focus on assessing the improvement in respiratory function among T2DM patients with concurrent pulmonary infections following IS respiratory training. In the second year, three commonly used essential oils (wintergreen, peppermint, and eucalyptus) will be integrated into IS respiratory training. The goal is to enhance patient comfort during training while improving the effectiveness of respiratory training and investigating the mechanisms and effects of different essential oils. The expected outcomes of this study include demonstrating that IS respiratory training combined with an essential oil diffusion device developed by our research team, could more effectively improve the respiratory function of T2DM patients with pulmonary infections. Building on this foundation, the project aims to increase patient comfort during training sessions by incorporating three commonly available essential oils-wintergreen, peppermint, and eucalyptus. This approach is expected to enhance patient acceptance of respiratory training interventions, laying a solid foundation for clinical promotion. Additionally, the study will analyze the differential effects of these essential oils on respiratory function improvement, providing a cornerstone for future clinical research in the fields of chemistry,