Ground-glass density shadow of the lungs, a faint imaging change of the lungs, is usually seen in atypical lung infections such as pneumonia and mycoplasma pneumonia. If there are pet cats, dogs, chickens, ducks, or blankets, pigeons and other environments in the home, and the lungs inhale such air for a long time, the ground glass density shadow changes in the lungs are also likely to occur. If the ground glass shadow does not dissipate after treatment, or even if a ground glass nodule is formed when the lung is reexamined, it is important to pay close attention to it. At present, pulmonary nodules are divided into three conditions: ground glass nodules, partially solid nodules and solid nodules. We should be alert to ground glass nodules larger than 0.8 cm and worry whether they will deteriorate to form early lung cancer in situ, such ground glass shadow and ground glass nodules need dynamic follow-up. Depending on the size to determine 3 months, 6 months or 1 year, regular review of high-resolution CT of the chest is required to determine whether it is a growing nodule, and if it is, early intervention surgical treatment in thoracic surgery should be considered.