Connective tissue diseases(CTD)are a spectrum of heterogeneous diseases with multiple organ involvements.Interstitial lung diseases(ILD)are serious complications of CTD.There is great heterogeneity in pathogenesis,clinical manifestations,and treatment of different CTD-ILD.Previous basic and clinical studies have explored the pathogenesis of CTD-ILD,and the"dual-target"treatment strategy has therefore emerged.The implementation of the"dual-target"treatment strategy helps to control CTD activity and lung inflammation in the early stage,prevent the progression of pulmonary fibrosis,and thus improve patient survival and quality of life.