In our country, it is reported that there are a lot of cases which the slope failure is caused by the rainfall. Then, the purpose of our study is to analyze slope failure simulation caused by rainfall on fill slopes by DEM. Especially we focus on the real field. And, we regarded a decrease of clod strength as a decrease of frictional coefficient on this analysis. As a result, we have been able to calculate the decreasing rates of frictional coefficient and the start speeds of three cases that had different ways of groundwater's rising. From this result, it is recognized that the decreasing rate of the Case3 was the largest, and the start speed and move distance were also large. So, when it is heavy rain, we should take note it in Case3, and we can say that the possibility of influencing the inhabited area under the slope is high at collapse.
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