The time-decay rate toward the viscous shock wave for scalar viscous conservation law $$u_t+ f(u)_x =\mu u_{xx}$$ is obtained in this paper through an $L^p$ estimate and the area inequality in [1]
provided that the initial perturbations are small, i.e., $||\Phi_0||_{H^2}≤ε,$ where $\Phi_0$ is the
anti-derivative of the initial perturbation. It is noted that there is no additional
weighted requirement on $\Phi_0,$ i.e., $\Phi_0(x)$ only belongs to $H^2
(R).$
