  Recent advances in both the MHD turbulence theory and cosmic ray observations
call for revisions in the paradigm of cosmic ray transport. We use the models
of magnetohydrodynamic turbulence that were tested in numerical simulation, in
which turbulence is injected at large scale and cascades to to small scales. We
shall present the nonlinear results for cosmic ray transport, in particular,
the cross field transport of CRs and demonstrate that the concept of cosmic ray
subdiffusion in general does not apply and the perpendicular motion is well
described by normal diffusion with M_A^4 dependence. Moreover, on scales less
than injection scale of turbulence, CRs' transport becomes super-diffusive.
Quantitative predictions for both the normal diffusion on large scale and super
diffusion are confronted with recent numerical simulations. Implication for
shock acceleration is briefly discussed.
