This is an open-label, uncontrolled, prospective long-term observation of Specific Drug in the treatment of patients with pulmonary hypertension up to 4 years. 160 patients with primary (idiopathic and familial) pulmonary hypertension (PH) or pulmonary arterial hypertension (PAH) due to scleroderma with New York Heart Association (NYHA) functional class and exercise capacity, defined as class III and IV planned to enroll. Efficacy, safety and tolerability of the drug and the survival of the patients will be observed.