Lung squamous carcinoma types can be classified according to differentiation type, differentiation degree, and anatomical site type. 1. Classification of differentiation type: according to the presence or absence of keratinized beads and intercellular bridges, squamous carcinoma is divided into three major categories: keratinized squamous carcinoma (the formation of keratinized beads of any proportion can be seen), non-keratinized squamous carcinoma, and basal cell-like squamous carcinoma (the proportion of basal cells is >50%). 2. Degree of differentiation: according to the degree of differentiation of squamous cell carcinoma, squamous cell carcinoma is divided into high and middle level and low level of differentiation, the lower the degree of differentiation, the higher the degree of malignancy. 3. Anatomical classification: it is divided into central type and peripheral type. Central type, squamous cell carcinoma and small cell carcinoma are common, and the tumor tissues have the tendency to grow into the canal, which is easy to develop necrosis and abscess. In peripheral type, these patients are prone to centralized necrosis and cavities.