Abstract: Factors that might trigger the reactivation of an existing landslide in mountain areas were examined and the factor of safety was obtained by using transferring coefficient method. The results indicate two categories of factors, which are internal factors and external factors, could attribute to the landslide reactivation. Mainly, under the unfavorable geological conditions, the landslide reactivation can be triggered by human activities and precipitations. Especially, the rainfall has the highest probability to trigger the landslide. Therefore, drainage facilities should be considered and installed in the landslide area.

Key words: Landslide, Stability Analysis, Precipitations