Abstract: In order to analyze the force and behavior of the anchor installation process of a semi-submersible platform, a coupling model of hull and anchor chain is established based on the parameters of a semi-submersible platform and the anchor arrangement scheme. The R4 / K4 anchor chain and Stevin Mk3 anchor are selected. Based on the investigation of seabed rock and soil in a sea area in the eastern South China Sea, the DIGIN software is used to simulate and analyze the anchor installation process under different soil conditions and different water depths. The relationship between the anchor tension at the key points and the installation tension at the guide wheel, the relationship between the drag anchor distance and the penetration depth of the anchor claw and the resistance at Dip-Down are obtained. The results show that under certain soil conditions, the drag anchor distance has a parabolic relationship with the resistance at Dip-Down, and the resistance at Dip-Down is linearly related to the penetration depth of the anchor claw. The approximate anchoring distance and penetration depth of anchor claw under installation tension in different water depth conditions of two oilfields are obtained, which provides a reference for the study of anchor installation behavior of semi-submersible platform.