We are interested in the stochastic property of some ''Anosov-like'' system. In this paper we will treat a transitive and partially hyperbolic di¤eomorphism f of a 2dimensional torus with uniformly contracting direction, and show that if f is of C 2 and admits an SRB measure, then f is an Anosov di¤eomorphism. In our proof we use the Pujals-Sambarino theorem for C 2 di¤eomorphisms with dominated splitting. In the case of C 1þa the above statement is not true in general, i.e. we can construct a C 1þa counter example of Maneville-Pomeau type.