Fungal pneumonia refers to lung infection caused by fungi and actinomycetes. After fungi invade the lungs, they can cause pneumonia of varying degrees. In severe cases, lung tissue necrosis may occur, and the disease may even spread to other parts of the body through the bloodstream. It ranks first among all visceral fungal infections. Although it is relatively rare, it often occurs on the basis of many systemic diseases, which can make diagnosis and treatment difficult. Therefore, it has a certain important significance in clinical work. Fungal pneumonia is not a common disease. In the past 10 to 20 years, due to the widespread use of broad-spectrum antibiotics, cytotoxic drugs and adrenal cortex hormones, its incidence and clinical importance are increasing, and it is receiving increasing attention.