  The existence of the spectral break around $\sim 3 \times 10^{15}$ eV in the
cosmic ray spectrum (referred to as the `knee') is one of the biggest questions
in cosmic ray astrophysics. At the same time, the origin of cosmic rays above
the knee energies (between 10$^{15}$ and 10$^{18}$ eV) is also still unsettled.
In this paper, we investigate how the hypothetical extragalactic CRs after
modulated by the galactic wind contribute to the knee in the CR spectrum. We
numerically calculate the modulated energy spectrum of the hypothetical cosmic
rays coming into the galaxy from just outside of the ``galactic sphere'' where
the galactic wind terminates. We show that the observed knee structure is
reproduced well by a superposition of the modulated component and the galactic
cosmic rays originating in supernova remnants.
