Abstract: In order to R & D high performance offshore wind power steel with high heat input welding, the composition and production process of the steel were determined by the design principle of low carbon content, low carbon equivalent and microalloying based on the ultra fast thermo mechanical control process (TMCP), and the mechanical properties of trial production EH36 steel were tested and analyzed. The results show that the new generation of high performance offshore wind power steel contains carbon, silicon, manganese, phosphorus, sulfur and appropriate amount of niobium, vanadium, titanium alloy elements. The ductile brittle transition temperature of the steel is below -80 ℃, the tensile strength is 532 MPa, the yield strength is 434 MPa, the fatigue strength is 227. 8 MPa, and the reduction of area is more than 70%. It has the characteristics of short production cycle, fast delivery, high toughness, good lamellar tear resistance, good fatigue resistance, excellent crack arrest performance and can be welded with high heat input.