It is generally accepted that fasting plasma homocysteine (HCY) levels of 5-15umm/L, ≥16umm/L, are considered to be hyperHCYemia, and hypertension with high HCY is called “H-type hypertension”. In addition, elevated HCY can also increase platelet adhesion and aggregation, thus promoting thrombosis and leading to an increase in the incidence of stroke and myocardial infarction. The rate of HCY in our hypertensive population is very high, with 91% of men and 63% of women having an average of 75% elevated HCY. The high prevalence of “H” hypertension may be an important cause of the high incidence of stroke in China. The incidence of cardiovascular events in patients with “H” hypertension is approximately 5 times higher than in patients with hypertension alone and 25 to 30 times higher than in normal subjects. Among the controllable factors contributing to stroke, hypertension and elevated homocysteine have a synergistic effect in triggering stroke. “High blood pressure + high HCY” increases the risk of cardiovascular events 30-fold. The main causes of elevated HCY are: 1) excessive methionine intake, i.e., excessive intake of animal protein; 2) insufficient intake of vitamin B6, B12 and folic acid, especially folic acid; 3) impaired excretion of sulfur-containing amino acids due to renal insufficiency; 4) hypothyroidism; 5) genetic metabolism-related. Then, according to the etiology, H-type hypertension treatment should also be two-pronged – lowering blood pressure and homocysteine at the same time. Controlling animal protein intake, eating green vegetables and fresh fruits regularly, and taking timely folic acid and vitamin supplements can reduce and slow down the risk of stroke that may be triggered by high blood pressure. At the same time, since Chinese people tend to use oil stir-fry in cooking, etc., it is easier to lose folic acid and vitamins when eating the same vegetables compared to foreigners, so it is also a good idea to actively take folic acid supplements in addition to cooking in oil stir-fry as little as possible. Long-term use of folic acid can reduce HCY and can reduce the risk of stroke by 25% for primary prevention; supplementation with vitamins such as folic acid can reduce the death rate of stroke by 37%.