Lotus is a perennial aquatic herb. The rhizome is transverse, thick, with swollen internodes, many longitudinal stomata inside and hairy adventitious roots outside. Leaves grow on the nodes, exposing the water; Petiole inserted in the center of leaf back, stout, cylindrical and spiny; The leaves are round. The flour above is green, and the veins below shoot from the center. Lotus stems are petioles and pedicels of perennial aquatic herbs, also known as lotus stems, lotus stems and lotus leaf stems. A slight breath, a faint taste. Bitter in nature, flat in nature, entering spleen and bladder meridian. Function of relieving summer heat and clearing heat, regulating qi and eliminating dampness; Breathe through the chest, soothe the stomach and prevent miscarriage. Indications: summer dampness, chest tightness and discomfort; Diarrhea; Dysentery; Gonorrhea; Take it down; Vomiting during pregnancy, restless fetal movement. Chemical composition of traditional Chinese medicine: Lotus stem contains papaverine and protonated fluorescein. The effect is to relieve summer heat, clear heat, regulate qi and eliminate dampness; Propagating chest, calming stomach and preventing miscarriage belong to Nymphaeaceae. Used for treating dampness and chest distress in summer; Diarrhea; Dysentery; Gonorrhea; Take it down; Vomiting during pregnancy and restless fetal movement have great influence. Generally born in swamps, ponds, lakes or rice fields, wild or cultivated. Harvesting in summer and autumn, removing leaves and lotus leaves, drying in the sun or fresh using.