U-shaped teaching mode. U-shaped teaching mode is called U-shaped teaching mode abroad. 1999.U-type teaching mode was put forward by Otto Summer in 1999. The outstanding feature of the British-American teacher education cooperation model (that is, the British teacher partner school model and the American professional development school model) is to attach importance to the important role of primary and secondary schools in teacher education. With the continuous development of the times, "U-G-S" came into being. It is a new teacher education model and a tripartite cooperation of "university-local government-primary and secondary schools (U-G-S)".