Cryogenic loading arm is a new kind of marine loading arm which is used for conveying some cryogenic media such as LNG, ethylene and so on. Materials used for the main pipeline mainly depend on the temperature of products. The supporting structure of the arm is designed specially to prevent it from contacting the cryogenic pipeline, and to avoid the material performance changing in the condition of cryogenic temperature, such as cold shortness. The swivel joint, which is the key part of the loading arm, is also designed specially to make the whole six pieces of swivel joint cycled by Nitrogen gas. In this case, it can put the vapor out of the swivel joint to avoid icing in the race way of swivel joint and protect the race way from being broken.