<正> The principal component analysis(PCA(is one of the most celebrated methods in analysingmultivariate data.An effort of extending PCA is projection pursuit(PP),a more general class ofdimension-reduction techniques.However,the application of this extended procedure is often hamperedby its complexity in computation and by lack of some appropriate theory.In this paper,by use of theempirical processes we established a large sample theory for the robust PP estimators of the principalcomponents and dispersion matrix.