Constructed tree (scientific name Broussonetia papyrifera) alias Chu Peach, etc., for deciduous trees, 10 - 20m high; bark dark gray; twigs densely pilose. Crown open, ovate to broadly ovate; bark smooth, light gray or gray-brown, not easy to crack, the whole plant contains latex. It is a strong masculine tree species, with strong adaptability and resistance.

Constructed trees are fast-growing, adaptable, widely distributed, easy to reproduce, high calorie, short rotation period. Its root system is shallow, the lateral roots are widely distributed, fast growing, strong sprouting and tillering, resistant to pruning. Resistance to pollution is strong. In China's temperate, tropical are distributed, regardless of the plains, hills or mountains can grow, its leaves are very good pig feed, its bast fiber is a high-level raw material for papermaking, the material is white, its roots and seeds can be used as medicine, the sap can cure skin diseases, the economic value is very high.