Abstract: In the design of high frequency transformers, the primary and secondary windings are usually interleaved to reduce leakage inductance and AC resistance. However, the change of winding structure will affect the value and distribution of parasitic capacitance parameters, thereby causing changes in broadband resonance characteristics. In order to clarify the affect of winding arrangements on parasitic capacitance, frequency-dependent leakage inductance and resonant frequency, this paper firstly establishes the distributed equivalent capacitance models of four typical winding structures considering the winding arrangement and twisting method. Based on the energy equivalent principle, the capacitance analytical calculation formula of six capacitance models with lumped parameters under different winding arrangements is derived. Then, considering the frequency-dependent effect of leakage inductance parameters in the wide frequency range, a lossy inductance model containing frequency-dependent parameters is established based on the principle of electro-magnetic duality principle, and the extraction method for each parameter is given. On this basis, the broadband impedance model of high-frequency transformer with typical winding arrangements is constructed. The calculation results of parasitic capacitance, leakage inductance, open-circuit and short-circuit impedance and resonant frequency are compared with simulation and measurement results to verify the effectiveness of the proposed method.