Papaya, also called Hovenia dulcis Thunb. Rhamnaceae, a deciduous tree, grows on sunny slopes, valleys, ditches and roadsides, or is cultivated. Papaya is distributed in tropical and subtropical sunny slopes. Like most deciduous trees, papaya sprouts and grows leaves in April. The branches and leaves grow to a certain extent, and yellow-green flowers grow at the top, with a diameter of about four or five millimeters and oblate petals. At the end of April and the beginning of May, a blue fruit grows after the flower withers, which is close to spherical at first, and then gradually becomes grayish brown, and the fruiting body is twisted into a cross "_", so papaya is also called cross fruit and ten-seed fruit, with petal-shaped brown seeds at the top.