THE plane stress steady crack growth in power-law hardening materials is significant in theoretical research and practical application, especially in the application in aeronautic and aerospace industries. But people have not yet found any analytic solutions to it because of the mathematical difficulty of the problem. THE plane stress steady crack growth in power-law hardening materials is significant in theoretical research and practical application, especially in the application in aeronautic and aerospace industries. But people have not yet found any analytic solutions to it because of the mathematical difficulty of the problem .