Portulaca oleracea is Panicum miliaceum of Portulaceae. Stubby and juicy, hairless, with a height of 10-30cm, born in the sunny places such as roadside fields and garden ruins. It is distributed all over China. This species is a medicinal and edible plant. The whole herb is used as medicine, which has the functions of clearing heat, promoting diuresis, detoxicating, reducing swelling, diminishing inflammation, quenching thirst and diuresis. The seeds are bright. Millet. It is wrinkled and curled, and often forms a ball. The stem is cylindrical, with a length of 30cm, a diameter of 0. 1 ~ 0.2cm, a yellowish brown surface and obvious longitudinal grooves. The leaves are opposite or alternate, easily broken, and the whole leaves are obovate, with a length of1~ 2.5cm and a width of 0.5 ~1~ 2.5cm.: Green-brown, apex obtuse or emarginate, entire. Flowers are small, with 3 ~ 5 flowers at the end of branches and 5 petals in yellow. Capsule is conical and contains most tiny seeds. Slight breath, slightly sour taste. It likes warm and humid climate, has strong adaptability and can withstand drought, and can be cultivated in general soil in hilly plains. Born in sunny places such as roadside fields and garden ruins.