The present invention provides a pharmaceutical composition comprising the following active ingredients: 1) amlodipine or a pharmaceutically acceptable salt thereof, 2) pioglitazone or a pharmaceutically acceptable salt thereof, and 3) rosuvastatin or a pharmaceutically acceptable salt thereof. The present invention also provides use of the pharmaceutical composition in preparing a medicament for treating hypertension or metabolic syndrome. The pharmaceutical composition of the present invention can treat hypertension or metabolic syndrome, while effectively controlling the incidence of associated cardiovascular diseases and more potently improving survival prognosis in hypertensive patients. When blood pressure is lowered to desired level, the risk factors such as cardiovascular diseases are rectified, metabolic disorders and prognosis of patients are improved, and survival rate of hypertensive patients is raised.