Abstract: The boundary of the transitional region between Qinling Mountains and Huanghuai Plain was divided first in this paper, then some features of physical geography in the transitional region were discussed. (1) The east boundary of the transitional region is at the contour about 100 m, and the west boundary is at the contour about 500 m. The area of the transitional region is about 26 000 km²,which makes up 15.9% of total area in Henan Province.(2) The natural features in the transitional region possess transitional characters evidently in two directions, one is from the western mountain to the eastern plain and the other is from southern subtropical zone to northern temperate zone. (3) Torrential rain especially for strong torrential rain is frequent in the transition region, and there are many torrential rain centers, such as Lushan torrential rain center, Biyang torrential rain center, and so on. A majority of torrential rain is distributed among 100-200 m above sea level. (4) The winter temperature at 100-400 m above sea level in the transitional region is not only higher than in Huanghuai Plain where its altitude is lower than the transition region's, but also higher than in Qinling Mountains where its altitude is higher than the transitional region's. The highest temperature in January appears at 350-400 m above sea level in the transitional region. The warmer belt in the transitional region is called warm slope belt, of which thickness varies from 100 m to 250 m above sea level. (5) Torrential rain and warm slope belt in the transitional region were formed by atmospheric circulation and local terrain. Frequent torrential rain and warm slope belt had tremendous influence on soil properties, plant distribution and local climate in the transitional region.