1. Occurrence and development of Cercis chinensis leaf blight disease reduce the value of Cercis chinensis for appreciation.

2. The morphologic and biological of Cercis canadensis and the growing characteristics of its introduction, multiplication technology and its application in landscape were expatiated.

3. Objective: To separate, purify total flavonoids from Cercis chinensis Bge and analyze their flavonoid aglycones and content by spectrum method.

4. Cercis chinensis leaf blight disease is a new disease that infects and causes harm to Cercis chinensis, about which there are no researches internationally thus far.

5. To study the purification condition of red pigments from flowers of Cercis chinensis Bge.