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In this note, we prove that a 3-dimensional steady Ricci soliton isrotationally symmetric if its scalar curvature $R(x)$ satisfies  $$\frac{C_0^{-1}}{\rho(x)}\le R(x)\le \frac{C_0}{\rho(x)}$$ for some constant$C_0>0$, where $\rho(x)$ denotes the distance from a fixed point $x_0$. Ourresult doesn't assume that the soliton is $\kappa$-noncollapsed.

3d steady Gradient Ricci Solitons with linear curvature decay