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This study aims to thoroughly investigate how the equilibrium of pre-service teacher in the probability theory course through learning based on Valsiner theory. The method used is descriptive qualitative by taking as many as one experimental class as a sample to be traced. It was concluded that through observations and short interviews it could be shown that in the first and second meetings, students were still experiencing cognitive conflict so that there was no equilibirium in students. then at the third, fourth meeting and the next meeting students have shown a positive response so that a balance or equilibrium can be seen from each student representatives response through the given teaching material and also through inter-group discussions between groups so that there is uniformity of knowledge and no longer heterogeneous.