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Objective:To investgate the clinic features of interstitial lung disease(ILD) and pulmonary arterial hypertension(PAH) secondry to connective tissue disease(CTD).Methods:485 patients in Hospital diagnosed as having connective tissue disease between January 2005 and febulary 2008were retrospectively analyzed.Results:(1)101 patients (81 females and 20males)were found to have connective tissue disease associated interstitial lung disease (CTD-ILD).