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In this talk, a generalization of the usual Green function of Lapalcian operators to a class of nonlinear degenerate operators with X-ellipticiry is considered.Maximum principle and some apriori estimates in the sense of distribution are established, and a comparison with corresponding Green functions is also presented.As an application of the Green function, we will show a locally Holder continuity for nonlinear degenerate sub-elliptic equations with inhomogeneity items.