The main functions of Hedyotis diffusa are: clearing away heat and toxic materials, clearing away heat and promoting diuresis, clearing away heat and removing blood stasis, and clearing malnutrition. Black bean is a typical high-protein and low-fat food, which contains 18 amino acids, especially 8 amino acids necessary for human body. It also contains 19 kinds of oleic acid, with 80% unsaturated fatty acid content and high absorption rate. The contents of zinc, copper, magnesium, molybdenum, selenium, fluorine and other trace elements in black beans are very high, which are very important for delaying human aging and reducing blood viscosity. Both can be cooked and eaten together, which can clear away heat and detoxify, enrich blood and benefit kidney!