Many researchers are trying to teach in the Smart Cloud Platform(SCP), but most of them either describe it on the conceptual level or realize it on the technical level. The development of the Pedagogical Interaction Model(PIM) has important educational significance and provides guidance for teaching in the emerging cloud learning environment. This study designs the PIM based on the SCP and further applies it in the class teaching of a junior high school. A total of 94 subjects from two classes were selected. One class was taught in SCP, and the other was taught in the traditional class. The pre-test shows both classes have little statistical significance in physics scores. After treating in the SCP for half a semester, the score of the treatment group was significantly higher than that of the control group which means the use of the PIM proposed in this paper can improve students' academic performance. The PIM has promising outlook in improving deep collaboration, communication, and personalized learning.