Abstract： Objective To investigate the chest imaging features in H7N9 subtype human avian influenza.Methods The clinical and imaging data of 7 patients with H7N9 subtype avian influenza were collected and the chest imaging manifestations were analyzed.Results The main clinical symptoms of H7N9 patients were fever (n =7) and cough (n =4).The ground-glass opacities or consolidations in pulmonary segmental or lobar distribution were showed (n =5) at the initial stage (within 3 days).Air bronchogram could be found in 4 cases.The bilateral lungs were rapidly involved with multiple or diffuse distribution (n =7) at the progressive stage (3-6 days),and 4 patients were died at this stage.The linear,reticular and honeycomb shadows were seen with partial absorption of lesions (n =2).Conclusion The main imaging features of H7N9 subtype human avian influenza are the segmental or lobar consolidations on the initial stage and rapid involvement of bilateral lungs with disease progression.