Landslide phenomena are caused by many factors such as of the land, geological features, properties of soil, water balance and others.
We collected many data over more than 20 years, in order to analyzed on mechanism of the landslides called HASAITAI JISUBERI occurred in SHIKOKU ISLAND.
In this paper, we studied statistically on the distribution of gradient of ground surface between the normal area and the landsliding area, and the following conclusions were obtained.
1. Both distribution of gradient of ground surface are different in half of cases, and be same in rate of tenth.
2. Slopes having landsliding are grouped into 4 types, and each type is appeared with defined protortion.
3. Landslides occur in all lay of the land.
4. Landslides area makes good use for farmland.
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