Abstract: Among the coral sand-filled foundations, only the fine-grained coral sand could be applied to conventional indoor compression tests. It is not reasonable to apply the fine-grained coral sand compression test results to engineering practice. In this study, the pressure-dry density relationship curve and the vertical strain-dry density relationship curve of coral sand, coral branch, as well as coral sand and coral branch mixture were obtained by the compression test of large indoor samples. Based on these curves, the stratified summation method and the dry density obtained from the field test are used to calculate the virtual paving thickness of the coral sand fill foundation and the total settlement of the airport runway, which provides a new calculation method for the settlement deformation of the coral sand dredger fill foundation.