The postgraduate practice innovation system has still some problems with innovative content, mentor guidance and innovation methods. This paper proposes a postgraduate innovation ability training system, named Ternary transformation and Triple fusion and third order with the goal of enhancing the ability of research, practice and innovation to cultivate high-level applied professionals under the background of science and education integration. This system establishes a diversified training model for students to participate in course production, individualized comprehensive training and scientific research projects, and builds a practical subject system that integrates scientific research and teaching achievements into a multi-disciplinary cross-integration subject. It further proposes a three-stage progressive training system covering basic experimental ability, professional practice ability and scientific research innovation ability. With the help of the diversified practice carriers, the postgraduate practical innovation ability is comprehensively improved, which promotes the cultivation of a new generation of information technology professionals for national development.