The control of oxide heterostructures at atomic level generates a rich spectrum of exotic properties and unexpected states at their interface [2].The frustration of magnetization and conductivity of manganite perovskite at surface/interface [3],which is inimical to their device applications,could also flourish in tailored functionalities in return.Here we prove that the exchange bias(EB)effect can unexpectedly emerge in a(La,Sr)MnO3(LSMO)“single” film when large compressive stress imposed through a lattice mismatched substrate.