Teaching tools are playing an increasingly important role in modern education, especially in this post-pandemic era, the outbreak of Covid-19 pandemic and the social distancing policy have brought fundamental changes to the education mode in China. Fully and rationally making use of multiple teaching tools in blended classrooms is helpful in realizing teaching goals, moreover, it can increase students’ interest in learning and activate classroom atmosphere. However, current studies on the teaching tools of blended classrooms fail to well exhibit teaching content in the classrooms, the existing tools only have limited functions, and such classrooms couldn’t effectively train students’ abilities to communicate or make self-evaluations. In view of these problems, this paper aims to study the selection and utilization of multiple teaching tools in blended classrooms from the perspective of synergistic effect. At first, this paper built an Evaluation Index System (EIS) for assessing the degree of synergy of multiple teaching tools when they are used in blended classrooms; then, it calculated the degree of order of these tools in the said classrooms; at last, this paper analyzed the effectiveness of the synergistic effect of different teaching tools.