Thin-layer CT has a thinner thickness of scanning layers and generally does not miss ground glass nodules in the lungs. Thin-layer CT is a kind of imaging examination, generally refers to the reconstruction mode in the scan, the scanning layer is thinner than the conventional CT, can reach about 1 mm, for most of the lung nodules will not be missed, ground-glass nodules generally refers to the increased density of the lungs like a rounded shadow, can be congenital nodules, can be formed after the infection, the majority of benign, and a small portion of the malignant tumors may also be possible. For asymptomatic patients with ground-glass nodules in the lungs, it is generally recommended to follow up and review regularly to observe the growth rate of the nodule, the presence of burr lobulation, vascular signs, vacuolar signs and other signs of malignancy, and if they appear to have the option of surgical treatment, avoiding tobacco and alcohol, and avoiding the environment of second-hand smoke.