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It is common to us that harmonic analysis has a close relation with partialdifferential equations .In 1952，A.P.Calderon A.Zygmund advanced the famous singular integral operators with originated from the solution to constantcoefficient elliptical equations. With the developmnent of harmonic analysis,the Calderon 一Zygmund singular integral operators include not only convolution operators and pesudodifferential operators，but also Cauchy imegra1operators related to curvature，commutators and so on.More and more they are applied into practical appliance.