Continuous Spring avoids fracture of traditional spring due to overload and fatigue of steel wire caused by forced mechanical bending of spring joint. It features one steel wire one-time shaping chain structure, with the advantages of even bearing capacity, rational, jointless, fracture-free, sink-free structure and high elasticity. Its fatigue strength, yield limit is unparalleled, and it is designed based on body weight distribution and backbone positions. It combines the functions of body protection, waist protection and health caring, reputed as "comfortable sleeping spring". It is the most precious in mattress, and is the new generation of soft mattress spring to replace the old generation.