Transformation, also known as transformation, refers to the mathematical idea of transforming unknown, unfamiliar and complex problems into known, familiar and simple problems through deduction and induction, so that the problems can be solved smoothly. Mathematical theories such as trigonometric function, geometric transformation, factorization, analytic geometry, calculus, and even rulers and rulers of ancient mathematics are permeated with the idea of transformation. Common transformation methods include: general special transformation, equivalent transformation, complex and simple transformation, number-shape transformation, structural transformation, association transformation, analogy transformation and so on.