The suction anchor is the core equipment of the mooring system of the floating facilities in deepwater oil and gas fields and is metaphorically referred to as the stabilizing anchor for FPsos to stand firm in the ocean. It is composed of a cylinder, a top cover, a cast lifting lug, an anchor head chain, etc. It is like a large steel suction cup. Through the suction pump installed on the top of the anchor, a pressure difference is created between the inside and outside of the anchor, firmly adhering itself to the deep-sea mud, and anchoring the FPSO firmly to the sea like a teeching post。