Objective To investigate the CT image performance characteristics analysis of silicosis. Methods 70 cases with silicosis in our hospital were selected and retrospectively analyzed. Compare low dose and regular dose CT scanning feature results, observe CT image performance characteristics analysis of silicosis. Results Statistic results (shadow size, intensity and staging) between low dose and regular dose had no statistic significant (P>0.05). 70 cases all had pulmonary parenchyma; fibrous plaque:Ⅱstage (14 cases) and Ⅲ stage (24) cases, interstitial fibrosis: 50 cases existed, there were 9 cases inⅡstage and Ⅲ stage had increased fibrous thickening and thickening blood vessel bundle, There were 6 patients with typical interlobular septal thickening and pleural thickening. Ⅱstage (8 csaes) and Ⅲ stage (9 cases) had emphysema; Hilar and mediastinal lymph nodes: stage Ⅰ (4 cases) there is a clear silicone powder with swelling,Ⅱstage (6 cases) and Ⅲ stage (12 cases) existed typical punctate calcification.Ⅱstage (7 cases) and Ⅲ stage (16 cases) existed typical thickened pleura. Conclusion Image feature of silicosis on CT scan and life condition can make accurate diagnose; low dose CT can be seen as auxiliary examination on silicosis.