ObjectiveTo observe the dynamic imaging change in pulmonary candidiasis and to evaluate the clinical diagnostic value of imaging for pulmonary candidiasis. MethodsThe chest Xray and/or CT imaging of 35 patients with pulmonary candidiasis were collected, the dynamic imaging change between antimicrobial therapy before diagnosis and  antifungal therapy after diagnosis was compared and analysed retrospectively.ResultsFor 35 patients receiving antimicrobial therapy before diagnosis, there were 10 cases (28.57%) with no imaging change, 18 (51.43%) with progressive imaging change and 7 (20.00%) with new imaging focuses, the total therapeutic effective rate was 0.00%, but for antifungal therapy after diagnosis, there were 29 cases with improved imaging change,  3 (8.57%) with no imaging change, 2  (5.71%) with progressive imaging change, and 1 (2.86%)  with new imaging focus, the total therapeutic effective rate was 82.86%; The difference between two treatments was statistically significant（χ2=50.07, P<0.01）.ConclusionThe observation of the dynamic imaging change in pulmonary infection of unknown origin before and after treatment is valuable for early diagnosis and treatment of pulmonary candidiasis.