This paper focuses on the modeling and optimization of the laminated busbar used in high power inverters. First, through the circuit structure analysis, the commutation loops of the laminated busbar are analyzed in a single-phase H-bridge inverter; then, the commutation loops are modeled and simulated via the three-dimensional (3-D) finite element simulation, and unbalanced commutation loops' inductances of the original three-layer laminated busbar are obtained. Additionally, a low cost and accurate parasitic inductance extracted measurement method for the busbar, which is based on the equalization of resonance impedance, is proposed; then, a compromised optimal design scheme is suggested to balance and minimize the parasitic inductance of the busbar, and this optimal scheme is verified by simulations. Finally, some optimization principles of laminated busbar are proposed.