Evaluation criteria for rockfall is proposed using 137 real data. Rockfall data was classified 3 categories considering damage level of rockfall protection fence, and rockfall energy for each was made a calculation. In results, 50kJ, 70kJ and 117kJ of rockfall energy are proposed as evaluation criteria.

Evaluation items were deducted by based on literature materials to supplement the evaluation system of rock cut-slope in national road. Delphi survey of experts were conducted to review the final evaluation items. As a result of reviewing the significance through stepwise multiple linear regression, all of deducted items were statistically significant because these had lower P-value than 0.05. And It was confirmed that the items were selected appropriately as they had relatively similar levels of the weight.