有限域上多项式型的低差分均匀度函数在分组密码的非线性组件S盒中有着重要的作用.为了增强S盒的混淆作用,应用在S盒中的函数应具有较高的非线性度和较高的代数次数.文章通过改变Dobbertin类的单项式函数在有限域F_(2n)的一个子域上的函数值,构造了两类新的多项式型的低差分均匀度函数,并确定了这两类多项式型函数的代数次数和第二类函数的非线性度. The low degree of uniformity function of polynomials on finite field plays an important role in the S-boxes of nonlinear components of block ciphers. In order to enhance the confusion of S-boxes, the functions used in S-boxes should have high nonlinearity and Higher algebraic times.This paper constructs two kinds of new polynomial low differential uniformity functions by changing the function value of the Dobbertin class monomial function over a subfield of the finite field F_ (2n), and determines the two Algebraic numbers of quasi - polynomial functions and non - linearity of the second kind of functions.