Pure ground glass nodule of 7~9mm considering pre-infiltrative lesion is generally important, the corresponding lesion has the possibility of malignancy, which may lead to the progression of the lesion if not controlled in time. Clinically, nodules can be found in the lung through lung CT examination, according to the density can be divided into pure ground glass nodules, solid nodules, mixed ground glass nodules, the size of the lesion is 7~9mm to consider pre-infiltrative lesions, which means that combined with the characteristics of the lesion and the related symptoms to consider that the lesion has the risk of infiltration, and it may develop into infiltrative lung cancer, it is feasible to perform a puncture biopsy or surgical resection of the lesion tissue to send for pathological examination, to determine the type of pathology, so as to guide further treatment options. Pure ground glass nodule 7-9mm is considered to be a pre-invasive lesion, and it is recommended to consult with a professional hospital in time, and carry out standardized treatment under the guidance of clinicians to prevent delaying the condition.