The “G-U-S” three-pronged teacher co-cultivation mechanism refers to an institutional form and working mode in which the government, universities, primary and secondary schools (including kindergartens) perform their respective duties, share the responsibilities, and cultivate teachers in collaboration. Although the existing three-pronged teacher co-cultivation mechanism has promoted the improvement of teacher cultivation, the integration of teacher education resources, the balanced development of regional education and the continuous improvement of teachers’ professional level, there are still some limitations, such as the single decision-making subjects, the unclear rights and responsibilities of the three subjects, the immature teacher cultivation program and the uncoordinated co-cultivation management. In order to further enhance the effectiveness of the three-pronged teacher co-cultivation mechanism, it is necessary to build a teacher co-cultivation subject alliance with certain administrative functions, clarify the respective rights and responsibilities of the three subjects, improve the teacher co-cultivation programs, and promote more coordinated co-cultivation management.