  We propose a new approximated expression for non-linear Dark Matter power
spectrum much beyond BAO scales. The proposed expression agrees with the result
of N-body simulation with the accuracy better than 2 % up to k=1.0 [h/Mpc] and
k=0.7 [h/Mpc] at z=3.0 and z=1.0, respectively. Even at z=0.35, the accuracy
remains within 10 % up to k=0.8 [h/Mpc]. In doing so, we used an approximation
for the kernel functions used in the Standard Perturbation Theory (SPT) which
is also used to prove the Reg PT proposed by Bernardeau et al. (2011).
