Rock sugar is sweet, mild and nontoxic. It can enter the spleen meridian and lung meridian, and has the effects of tonifying the middle energizer, harmonizing the stomach and moistening the lung. If steamed with oranges, the effect of relieving cough and resolving phlegm will be better. If it is salty and cold, it can enter the meridians of stomach, kidney, small intestine and large intestine, and has the effects of vomiting, clearing fire, cooling blood and detoxifying. If steamed with oranges, the effect of resolving phlegm and clearing heat will be better.