The formation factors of pulmonary hypertension in chronic pulmonary heart disease are as follows: 1. Idiopathic and hereditary pulmonary hypertension, which is generally uncommon in clinical practice. Certain patients with congenital heart disease will develop pulmonary hypertension if they do not receive timely treatment, so pulmonary hypertension has an important impact on the prognosis of patients with congenital heart disease; 2. Relatively common rheumatic immune diseases, also called connective tissue diseases, such as immune rheumatic and rheumatoid diseases, such as arthritis, dry syndrome, systemic lupus erythematosus, vasculitis, scleroderma, etc. can cause pulmonary hypertension. The number of incidences is relatively high. There is also heart failure at the end of heart disease will affect the pulmonary venous hypertension, and finally lead to increased pulmonary artery pressure, patients need to pay attention to whether there is hypertensive valve disease, cardiomyopathy, this part of the patient may eventually develop into pulmonary hypertension, with pulmonary hypertension heart disease and heart disease without pulmonary hypertension, the prognosis is very different; 3, respiratory disease caused by pulmonary hypertension, these patients will finally in the end stage lead to chronic pulmonary hypertension of pulmonary origin, causing right heart failure; 4, embolism caused by pulmonary hypertension, venous thrombosis leads to pulmonary embolism, which can also lead to pulmonary hypertension.