Accurate analysis of mooring system is one of the key issues in exploitation of platforms for deep water. In this paper, the depth of analysis about this combination mooring system is illustrated base on mechanical analysis and geometry, the consequences are obtained by MATLAB mathematical software, and then develop the mooring system analysis model. Focusing on the analysis of the critical situation of anchors and anchor chain in this mooring system then present regulatory process to ensure the system work well has important significance in practice.