Abstract: Objective To investigate the CT features of pulmonary injury in paraquat poisoning.Methods The chest CT image of lung injury in 6 cases of paraquat poisoning were analyzed retrospectively.According to different period of poisoning,the 6 cases were divided into 3 types:the early stage of poisoning (within 2 d),the middle stage of poisoning (3-14 d),the late stage of poisoning (>14 d).A comparison between CT signs and the pathological features of patients was made.Rusults Among this 6 cases,3 cases died,2cases pulmonary fibrosis was noted,1 cases recovered.According to different period of poisoning,the 6 cases were divided into 3 stages:in the early stage of poisoning (within 2 d),3 cases of all patients showed nothing remarkable,2 cases showed ground-glass opacity,1 case showed fuzzy lung-marking.In the middle stage of poisoning (3-14 d),all 6 cases showed ground-glass opacity,mosaic attenuation; 6 cases showed pulmonary consolidation; 4 cases showed subpleural lines; 4 cases showed bronchieetasis; 2 cases showed mid-lower pleural effusion.In the late stage of poisoning (>14 d),4 cases showed pulmonary consolidation and pulmonary fibrosis,3 cases showed ground-glass opacity and mosaic attenuation,1 case showed mid-lower pleural effusion; 1 case showed mediastinal emphysema.Conclusion The clinical pathology process of paraquat poisoning was in line with CT finding which was related with clinical stage and was helpful for clinical assessment of paraquat poisoning promptly and to guide the clinical treatment.