Objective To investigate the therapeutical effect of diammonium glycyrrhizinate in rat model of pulmonary fibrosis by Bleomycin.Methods Rats were randomly divided into 4 groups:pulmonary fibrosis group,NS group,DXM treatment group,glycyrrhizin treatment group.All rats in the treatment groups were intraperitoneal injection after 28 days when rats were produced pulmonary fibrosis,which lasted for 14 days.The treatment dose was DXM 3mg·kg-1·d-1,glycyrrhizin dose 150 mg·kg-1·d-1.After the 15th days,Lung tissues...