Abstract: Different types of deep-water anchors can all be used for mooring floating oil and gas platforms or wind turbines, of which the drag anchor becomes one of the most commonly used forms due to its simple structure, low overall cost and high anchor efficiency. When the drag anchor is installed in sandy soils, its penetration depth is usually shallow and there is a soil heave gradually formed in front of the dragged anchor. Because the soil heave has a significant impact on the penetration depth and holding capacity of the dragged anchor, it is nessenary to take the accumulative situation of the soil heave into acount when making the prediction analysis of the drag anchor installation. For this reason, an accumulation model of the soil heave has been proposed: First is to determine the calculation boundary of the soil heave, and then is to take the self-weight of the gradually accumulated soil heave as the soil pressure overlapping the anchor, which is used for the process of the anchor holding capacity developed with the drag and penetration. The applicability of the proposed soil heave accumulation model is verified by the theoretical analysis framework as well as the comparison with the published centrifuge tests. Then small-scale model tests are carried out and the influences of the soil heave on the holding capacity and motion trajectory of the drag anchor are quantitatively evaluated.