Gravity data was being acquired for the existing free-air anomaly and height could be calculated through the relationship equation. AUSTER DATA 1km intervals using a DEM to extract the Republic of Korea, the unknown height values of each interval, and this increase in value by substituting equation 1km intervals throughout the Republic of Korea was able to get free-air anomaly. In this process, standard gravity value, gravity measurement value also was able to estimate, by inducing the expression of these relations, as well as in South Korea North Korea local gravity data were also estimated.