Abstract: Finite element calculations of gravity framed suction anchors, a new frame-type gravity structure, were carried out using the commercial software Abaqus, and the effects of foundation dimensions and soil strength heterogeneity on the bearing capacity under different loading conditions were investigated, and the failure mechanism of gravity frame suction anchors in homogeneous and non-homogeneous clay was simulated under vertical, horizontal and overturning loading. Based on the existing research results of gravity anchors, single bucket suction anchors and tripod bucket suction anchors, the effect of the frame and skirt on the loading capacity is quantified. The results reveal that for shallow embedment depths, the frame structure enhances mutual constraint among suction anchor modules, thereby increasing the vertical, horizontal, and anti-overturning capacities. As the embedment depth increases, the reinforcing effect of the frame diminishes progressively, and the skirt depth becomes the primary contributor to improved load-bearing performance. Furthermore, a simplified estimation method for the undrained uniaxial load carrying capacity of the gravity framed suction anchor is proposed, which provides a technical basis for its wide application.