The present invention of "A method for producing functional food aimed at blood pressure reduction from the hydrolyzed vegetable solution, relates to study and develop methods for producing high-performance Angiotensin Convening Enzyme Inhibitor (ACEI) from vegetables by the following production, processes, such as washing, drying, powdering, ultrasonic extraction, vacuum concentration, freeze-drying, dissolution as well as enzymic hydrolysis etc., in addition, the said ACEI is acting as a kind of food additive.