The hillocks mainly distributes in the earth hill formed with granite of sounthern and western part of the Province

shaped in dipper-like

strip and curve. In the point of view of formation the collapse of hillock is divided in f positions of slope surface

precipice

hillock and alluvial fan. The better way is to plant grass and shrubs in mixing on slope

the principal plants for precipice are climbing vines planted along the top and down ridges of precipice;the collapsing site is harnessed according to special conditions

maily planted with coniferous trees;the alluvial fan is thought to be easy in erosion and shoud be planted with trees

shrubs and grasses simultaneously to control soil and water loss. The control of collapse of hillock takes the botanical measures as the predominent way that is supported by engineering measures.