The invention belongs to the technical field of medicine and discloses a pharmaceutical composition for treating cardiovascular and cerebrovascular diseases. The pharmaceutical composition is prepared by ginsenoside and carithamine as main ingredients and can be prepared into pharmaceutically or clinically acceptable dosage forms. The pharmaceutical composition has functions of expanding blood vessels of brain, reducing cerebral vascular resistance, increasing cerebral blood flow, obviously minimizing infarct area of brain tissues, obviously lightening behavior disorders caused by brain tissue necrosis, and the like, and can be used for preparing medicaments for treating diseases such as cerebral circulation insufficiency, cerebral thrombosis, cerebral embolism, brain blood vessels spasm, brain insufficiency, senile dementia, Parkinsonism, cerebral apoplexy, hypertension, hyperlipemia, arteriosclerosis, coronary heart disease, angina pectoris, miocardial infarction, etc.