MicroRNAs play crucial roles in pathogenesis of lung fibrosis.3 Tu reported that miR‐30 inhibited carbon tetrachloride‐induced liver fibrosis by attenuating TGF‐β1 signalling.4It was reported that microRNA‐30a was down‐regulated in bronchoalveolar lavage fluid from idiopathic pulmonary fibrosis patients.5 However, the biological function and underlying mechanisms of miR‐30a in pulmonary fibrosis remain largely unclear. This evidence concerns the gene TGFB1 and Hepatic fibrosis.