The LH2 loading and unloading arm system is a special equipment installed on the wharf and used to transfer the medium between the wharf and the liquid hydrogen ship. All parts in direct contact with the medium, such as the main pipes of the loading and unloading arms, rotary joints, etc., are completely vacuum-isolated from the environment to avoid the production of liquefied oxygen and minimize the loss of heat. The design of the quick connector has considered the insulation treatment and can be directly connected to the flange of the ship's manifold. The specially designed ERS ball valve will not generate liquid oxygen in the exposed environment even if it is disengaged in an emergency.