Effects of Jinshui Huanxian granules for patients with PPF:A Multiceter,randomized,double-blind,placebo-controlled trial

INTERVENTION: control group:???;experimental group:???; CONDITION: Pulmonary fibrosis PRIMARY OUTCOME: Annual decline rate of FVC; SECONDARY OUTCOME: Annual acute exacerbations;6MWT;Quality of life;Progression‐free survival;Severity of dyspnea;Health‐related quality of life;Clinical symptoms;All cause mortality; INCLUSION CRITERIA: 1.Patients diagnosed with PPF;2.Aged 18 or older;3.Comply with TCM syndrome differentiation standards;4.Not participate in any other drug trial within one month prior to enrollment;5.FEV1/FVC=70% before bronchodilator use;6.FVC% predicted =45%;7.Dlco% predicted corrected for normal hemoglobin (Hb) normal = 30%–< 80%;8.Sign informed consent forms.