With structural matrixes and the result of thesis[1],a class of sum (product) inequalities can be proved and Cauchy inequality and some results in the existing articles can be generalized.

• 本文通过构造矩阵和利用文[1]的结果，证明了一类和(积)式不等式，推广了柯西不等式及一些已有文献中的结果。