For \(0<p_1\le p_2<\infty \) and \(\min \{\alpha _1,\alpha _2\}>-1\) , we give estimates of the essential norm of Toeplitz operator \(T_\mu ^\beta \) acting from the Bergman space \(A_{\alpha _1}^{p_1}(\Omega )\) to \(A_{\alpha _2}^{p_2}(\Omega )\) for a nonnegative Borel measure \(\mu \) on a smoothly bounded strongly pseudoconvex domain \(\Omega \subset \mathbb {C}^n\) , where \(\beta \in \mathbb {R}\) such that \( n+1+\beta >n\max \left\{ 1,\frac{1}{p_j}\right\} +\frac{ 1+\alpha _j}{p_j}\) for \(j=1,2\) .