In the study, we wanted to test whether "math is the predecessor of science" and developed a new model of Causality Evaluation on fuzzy correlation and empirically examined the fuzzy correlation with student test scores in Mathematics and Science. Our sample comprised 416 Taiwanese students in the 12-years education. We applied fuzzy theory and conducted Transfer Function with the scores to illustrate the efficiency of our proposed methods. The results of empirical study showed that Mathematics and Science had high causality relationships each other.