Abstract: The multi-windings electronic transformer converter has many advantages, such as insulation, voltage superposition. However, affected by the complicated transformer energy flows, the modeling and simulation scheme that has engineering application values is still difficult to achieve. It hinders the efficiency improvement and development of research. The paper emphasizes that the energy flows within the push-pull transformer coils, the temporal and spatial characteristics of the leakage inductance, the relationship among the action time and associated coil, establishes the state space model, simulates with Matlab. The mathematical analysis, simulations and experiments show a close agreement with each other. More importantly, it could provide a valuable reference to study the external characteristics of transformers, improve the environment of power electronic devices and design the push-pull converter control system.