Abstract: To carry out in plant diversity conservation effectively and promote the greenhouse scenery .609 species (120 families ,233 genera)tropical and sub-tropical plants were cultivated in the exhibition greenhouse of Xi’an Botanical Garden. Among the plants, there are Orchidaceae (25 genera ,60 species),Palmae (14 genera ,29 species), tropical fruit plants (10 familes ,19 species) , and over 100 species are succulent plants（16 families,44 genera）. 22 species belongs to rare and endangered plants.8 plant areas are distributed as below by the plant morphology 、ornamental characteristics、application and the greenhouse character: succulent plant area; palm plant area; flower plant area;fruit plant area;epiphyte area:shade plant area;ornamental plant area;overhanging plant area. The greenhouse should enhance the introduction of rare and endangered plants and the specialized plants.To utilize the space of the greenhouse more effectively, herbaceous plants, overhanging plants and epiphytes should also be collected.