Xinjiang ebony is immature green plum or mature yellow plum, which is smoked with fireworks. If the green plum is soaked in salt water at night, it will frost after 10, which is called hoarfrost plum. Its efficacy is similar and should be avoided. Modern research believes that plum or plum juice contains more potassium and less sodium, so it is suitable for those who need to take potassium-expelling diuretics for a long time; Plum blossoms containing catechuic acid can promote intestinal peristalsis, so people with constipation should eat them. Prunus mume contains a variety of organic acids, which can improve liver function and is suitable for patients with liver disease. Plumbic acid can soften blood vessels, delay arteriosclerosis and have anti-aging effect.