Abstract This paper took the teaching of chlorine water as an example, applied threefold representations to know and understand substance from multiple angles, utilized mind map to show the relationships among threefold representations. The research results showed that SOLO classification theory could effectively guide teachers to determine students' learning zone of proximal development and effective teaching strategies; using mind map could directly indicated logical relationship among threefold representations, promoted the students to construct the organic integrative relationship among threefold representations, accelerated to translate and transform among threefold representations taking symbolic representation as the bridge, enabled students to develop the multi point knowledge structure to the related knowledge structure and the abstract expanding structure. Therefore, it was beneficial to improve the quality of students' learning in the teaching by using mind map to construct the overall relationships among threefold representations of chemistry.
