Undaria pinnatifida is cold and salty. Contains protein, minerals, vitamins, mannitol, fucoidan, dietary fiber, unsaturated fatty acids, alginic acid and other nutrients. Mannitol is a high-quality osmotic diuretic, which can be used for diuresis and detumescence to reduce the burden on the kidney. Rich in iodine, it can prevent goiter and maintain thyroid function; It also contains a polysaccharide substance, which can reduce blood lipid, cholesterol and blood pressure, and can prevent and adjuvant treat cardiovascular and cerebrovascular diseases; It contains cellulose, can remove bacteria, mold and dust particles in digestive tract, has expectorant effect, and can be used for treating chronic bronchitis and asthma. Undaria pinnatifida, also known as sea mustard, is an aquatic edible algae. 100g dry product contains crude protein 1 1.6g, refined fat 0.32g, sugar 37.8 1g and ash18.93g.. Undaria pinnatifida has complex nutritional components, including polysaccharide with anticoagulant effect and dioxin derivatives with fibrinolytic activity. Undaria pinnatifida contains polysaccharide compounds, lipids and sterols, which can prevent the degradation of insulin in adipose tissue. It also contains trace elements such as plant alcohol, unsaturated fatty acid, halide and sulfate, and has the functions of reducing blood fat, lowering blood sugar, anticoagulation, enhancing immunity and radiation resistance. Undaria pinnatifida is salty and cold, and belongs to liver, stomach and kidney meridians. It is not suitable for people with spleen and stomach deficiency and cold.