There are convex function and concave function, Which are of expansive application in many aspects, especially in inequality proof and error estimate.
凸(凹)函数有很多特性，这些性质可广泛应用于不等式的证明及误差估计等方面。
To gain sevrial decision method of convex (concave) function by the definition of convex(concave) function and Taylor formula.
利用凸（凹）函数的定义和泰勒公式给出了凸（凹）函数的几个判别法。
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