| Objective To analyze computed tomography (CT) findings of primary lung squamous cell carcinomas (LSCCs). Methods The CT images of 64 LSCCs pathologically confirmed were retrospectively analyzed. According to CT findings, LSCCs were divided into central and peripheral types. The central type was divided into type Ⅰ (intrabronchial small nodule, maximal diameter no more than 2.0 cm), type Ⅱ (nodule and mass in the hilum of lung), type Ⅲ (bronchial cast growth), and the CT features of various types of LSCC were analyzed by a double-blind study. Results Central type accounted for the majority of the LSCCs (48/64, 75%), especially type Ⅱ(35/48,72.9%). Type Ⅰ were 4 cases (8.3％) with an average diameter of（1.0±0.6）cm; 2 patients had moderate enhancement. The 28 lesions of type Ⅱ LSCC had irregular shape (23/28, 82.1%), unclear border (17/28, 60.7%), deep-lobulation (6/28, 21.4%), cavitation (7/28, 25.0%), necrosis (7/28, 25.0%), obstructive pneumonia and atelectasis (64.3%, 7.13%), and lymph node metastasis (20/28, 71.4%). Among them, 21 patients underwent enhanced scans; 9 cases had uniform enhancement, and 12 cases had uneven enhancement. Type Ⅲ were 9 cases (18.8%) with finger-like, branch-like shadow. Six cases underwent enhanced scan, tumor tissue was enhanced, and non-enhanced zone was mucoid impaction. The 16 lesions of peripheral LSCC (16/64, 25％) had clear border (13/16, 81.2%), speculation (31.3%), spinous protuberant sign (43.7%), deep-lobulation (31.3%), cavitation (12.5%), necrosis (31.3%), broad contact with pleural (37.5%) and lymph node metastases (31.3%). Eight patients underwent enhanced scans, 2 cases showed mild and uniform enhancement, 2 cases moderate and uniform enhancement, and 4 cases uneven enhancement. Conclusion There are certain CT characteristics in primary lung squamous cell carcinoma, which can help clinical diagnosis.