Benign solid lung nodule is an imaging diagnosis, which mainly refers to the discovery of round-like or irregularly shaped lesions less than 3cm in diameter in the lungs when the patient undergoes an X-ray or chest CT. Benign solid lung nodules are usually caused by inflammation, foreign body irritation, inflammatory pseudotumor, and fibrosis. Benign solid pulmonary nodules are essentially nodules filled with soft tissue density and are the least malignant in the classification of pulmonary nodules. In clinical observation, the morphology of benign solid lung nodules is characterized by smooth margins and the absence of blood vessels inside. Patients who have benign solid lung nodules and at the same time have long-term smoking, chronic lung diseases such as emphysema, chronic obstructive pulmonary disease, interstitial pneumonia; occupational exposure to asbestos, beryllium, cadmium, etc., need to pay attention to the patient and have regular review. The interval of reviewing CT for benign solid lung nodules is 6 months, if there are multiple small nodules, then it needs to be shortened to about 3 months for reviewing CT. If there is no change in the review, then continue to review regularly, and if there is still no change after 2 to 4 years, then most of the nodules will be stabilized. If there is an increase in the size of the nodule, or a change in the morphology of the blood vessels at the site of the nodule, or the appearance of a vacuole, or the appearance of lobulation, or the appearance of aggregation or pulling of the surrounding pleura, it is often suggestive of malignancy or malignant transformation, and surgery should be considered in a timely manner.