The semi-taut spread mooring system is adopted for deep water engineering vessel, and the structural design of anchor pad eye on suction pile shall guarantee mooring safety. This paper introduces the technical requirements of mooring system and suction pile anchor pad eye design and offshore installation in the Company's General Specifications. The maximum offset of engineering vessel and tension of mooring line is calculated by ARIANE7 software. The inverse catenary shape of bottom chain embedded in soil is analyzed by numerical iterative solution of governing differential equations method so as to determine mooring load at anchor pad eye on suction pile. The structural strength and stability of suction pile caisson and anchor pad eye is analyzed by ABAQUS software, in which the links lever arm effect on anchor pad eye main plate is simulated, and the influence of lateral fabrication deformation of V-wing plate inside suction pile caisson is considered. The anchor pad eye is made of low-carbon silicon manganese cast steel, with the stress-relief done by heat treatment to guarantee the mechanical and wear resistance properties. This suction pile anchor pad eye design can be used as a reference for engineering design of deep water suction pile of the same nature.