We employ cluster extension of dynamical mean-field theory (CDMFT) to systematically investigate the impact of double counting corrections on the correlated electronic structure of La3Ni2O7 under ambient pressure. By adjusting double-counting parameters, while maintaining a fixed Fermi surface, we observe a pronounced orbital-selective density of states change: the \(d_{z^2}\) orbital undergoes significant variation near the Fermi level with increasing \(E_{dc}^z\) , while the \(d_{x^2-y^2}\) orbital remains essentially unchanged throughout the entire range. Analysis of renormalization factor show the monotonic dependence with double counting in both \(d_{z^2}\) and \(d_{x^2-y^2}\) orbital, and it also identifies an optimal double counting window in \(d_{z^2}\) orbital aligns with experimental values. We also find the interlayer Matsubara self energy exhibits non-monotonic dependence on \(E_{dc}^z\) , deviating from theoretical predictions. This anomaly is attributed to the metallization of oxygen-bridged pathways, which disrupts the prerequisite for charge transfer via apical oxygen. Our results establish \(E_{dc}\) as a critical control parameter for correlated electronic structure in La3Ni2O7 and provide a computational framework for resolving orbital-dependent correlation effects in layered materials.
