Compared with prior art, advantage of the present invention is: this technique can eliminate metal latent defect, improves metal structure, and metal streamline is distributed rationally, and metal in close degree is good, extends the service life of bearing; Improve geometric accuracy and the dimensional accuracy of forging, eliminate Wall-Thickness Difference, and make forging shape to greatest extent close to the finished form of lasso, thus allowance and the tolerance of forging can be reduced, improve stock utilization, reduce machining operations amount, reduce the processing cost of bearing ring.