PROBLEM TO BE SOLVED: To provide a slope stability evaluation system and a slope stability evaluation method capable of quantitatively and continuously evaluating the stability of a slope and making relative evaluation so that it can be compared with the situation of other slopes. .. SOLUTION: The stability of the slope is evaluated by observing an observation point with a positioning satellite S. The positioning data storage means 101, the displacement velocity calculation means 102, the basic score setting means 103, the observation point position coefficient setting means 104, the individual score calculation means 105, the slope score calculation means 106, and the stability level evaluation means 107 are provided. .. The observation point position coefficient setting means 104 sets an observation point position coefficient (a coefficient that is set according to the installation position of the observation point and that is set to a higher value in the lower slope than in the upper slope) for each observation point. The individual score calculation means 105 is a means for setting and calculates an individual score obtained by multiplying the basic score by the observation point position coefficient for each observation point. [Selection diagram] Figure 1
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