Abstract: The traditional wireless power transfer (WPT) system usually comprises single primary coil and single pick-up coil, which is difficult to obtain larger transmission power due to its loosely-coupled structure and capacity limitation of the power device. In order to improve the transmission power of WPT system, this paper builds a WPT system with double primary coils and double pick-up coils. Based on the original WPT system (single primary coil and single pick-up coil), a pair of primary coil and pick-up coil are added, the system is analyzed by using the knowledge of coupling theory and circuit principle, and then the reliability and validity of the proposed strategy are validated through the Matlab simulations and experiments. Finally, the conclusion is drawn that when the load is 5 Ω, the transmission power of the WPT system with double primary and double pickup coil increases by 3.1 times and the efficiency increases by 9%, compared with the WPT system with single primary coil and single pick-up coil.