The present paper has proposed estimation formulae of ground settlement during earthquakes focused on lifeline earthquake engineerings. The proposed formulae were obtained by regression analysis using 404 data of the ground settlements in the past major five earthquakes. The maximum ground settlement is given by the function of height of sandy soil layer, embankment height, maximum ground surface acceleration and N-value of sandy soil layer. The estimation formulae were given for two cases of geological soil conditions; embankment and plane site. The proposed formulae were compared with following two results by other researchers to ensure the accuracy. The formula for embankment settlement was applied to other data of ground settlement observed on back fills around abutments, and also the ratio of the maximum ground settlement to the height of sandy soil layer at plane site settlement was compared with laboratory experimental results as to volumetric strain. They showed pretty good agreement.