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定义了Feller算子，该类算子包括Bernstein,Szasz, Baskakov,Gamma,Weierstrass等算子．应用一些概率方法，研究Feller算子及其修正对函数类的逼近，得到了更一般化的结果．“,”Feller operators are definded. Feller operators include some classical operators such as Bernstein,Szasz, Baskakov, Gamma, Weierstrass operators. Using some probabilitic methods, study the approximation of classes of functions for Feller operators and their modified forms,and obtain some general results.