In a distributed system with many inverters, the coupling exists because of the power grid impedance. With the increasing number and types of inverters, the coupling effect becomes more complex. Traditional analysis methods require a high-order transfer function for stability analysis. To simplify the study of complex systems, the resonance modal analysis was proposed for the multi-inverter system. The singularity of the admittance matrix is used to study resonant characteristics. Then, the output current of the inverter is split, and the resonant characteristics of input-grid current and interactive current are analyzed. The system performance of the resonant peak obtained by RMA is acquired by comparing current characteristics. The meaning of the participation factor is further explained. In the end, the simulation circuit model is established in Simulink to verify the correctness of theory.