Covering an areas of 1 ha, there are plants of 15 species, belonging to 9 genera, such as amorpha fruticosa L., cercis chinensis bunge, campylotropis macrocarpa, indigofera kirilowii, gymnocladus chinensis, sophora davidii and so on. As one of the three major angiosperms families , leguminosae is second only to CompositaeOrchidaceae. Many of the plants are important sources of starch, protein, oilvegetables in human foodare of great significance to human survival. “Rhizobium”, in the root of some plantswith the capability of nitrogen-fixing, is of great value for soil improvementfarmland rotation.