Abstract: This research took the Southern Henan Expressway as the object of study. Based on the data of plant communities and environmental characteristics during August and October 2016, the communities was classified by MSCA method. Moreover, the tpo 10 patterns of plant communities and their spatial distribution characteristics were analyzed. Results showed that there were significant differences between the distribution characteristics of the plant communities on the expressway side-slope in Southern Henan. The community similarity coefficient which was generally lower because it was determined by the historical factors of the formation and evolutionary process of the species themselves, and human disturbance and operation in the special habitats. According to the results of multivariate similarity clustering analysis, the plant communities on the slope was divided into 10 types. Ⅱ, Ⅲ, Ⅳ, Ⅴ, Ⅶ, Ⅷ and Ⅸ distributed in the Dabie Mountain ecological region, Ⅹ distributed in Tongbai Mountain ecological region, Ⅰ and Ⅵ widely distributed in the two regions. The community structure was mainly affected by slope, aspect and altitude. Ⅱ, Ⅵ, Ⅶ, Ⅷ, Ⅸ and Ⅹ adapted to slow slope while Ⅰ, Ⅲ, Ⅳ and Ⅴ adapted to steep slope. Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅵ and Ⅹ adapted to sunny slope while Ⅴ, Ⅶ, Ⅷ and Ⅸ adapted to shade slope. Light requirements of Ⅰ, Ⅳ, Ⅴ, Ⅶ, Ⅷ, Ⅸ and Ⅹ were not strict while Ⅱ, Ⅲ, Ⅵ distributed sunny slope. The altitude distribution of Ⅰ and Ⅵ was widely while that of Ⅱ, Ⅲ, Ⅳ, Ⅴ, Ⅵ, Ⅶ, Ⅷ, Ⅸ and Ⅹ were relatively restricted.