One of the hot points of senior high school entrance examination is the use of the two functions to solve mathematical problems or practical problems, these problems often need to use the two function expression of the relationships among the vari-ables, and finding out the two functions of the formula is the key to solving the problems. For the two function analytic method definition method, translation method, three point method, inter-section method, vertex method, symmetry, rotation method, pa-rameter method, and equivalent method.% 历届中考的热点之一，就是运用二次函数解决数学问题或实际问题，此类题目经常需要用二次函数表达其中的变量关系，而求出二次函数的解析式是解题的关键。求二次函数解析式的方法有定义法、平移法、三点法、交点法、顶点法、对称法、旋转法、参数法、等量法等。
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