Abstract: In order to improve the energy transmission performance of the energy signal parallel transmission system with shared partial energy channel in the application where the area of the transmission plate is limited, and realize signal bidirectional high-speed transmission, an electric-field coupled wireless power transfer (EC-WPT) system with signal plate and energy plate stacking mode is proposed, and the system topology, along with a method for crosstalk suppression, is presented.. Based on AC impedance analysis method and Shannon's second theorem, the mathematical models of power crosstalk gain, signal transmission gain, maximum signal transmission rate and power transfer gain are established, and the influence of cross-coupling capacitance on power crosstalk gain and signal transmission is analyzed. In order to reduce the influence of cross-coupling capacitance on signal transmission gain and maximum signal transmission rate, the design method of signal transmission plate area and signal branch parameters of EC-WPT system in stacked mode is given. Simulation and experiment verify that the proposed system and the proposed method can realize the bidirectional high-speed signal transmission of the system under large transmission power. When the output power of the system reaches 520.2 W, the forward transmission speed of the signal is 18.64 Mbit/s and the reverse transmission speed of the signal is 19.36 Mbit/s.