Green building and photovoltaic power generation technology could be organically integrated by wireless power transfer technology which transmits energy from outdoor energy collection system to indoor energy consumption system. However, concrete as a dielectric material affected the mutual inductance between the transmitting coil and the receiving coil, which changes the input impedance and ultimately lead to the decrease of the transmission efficiency of the system. This paper based on the circuit theory analyzed the influence of concrete medium on the transmission efficiency, and proposed an optimization strategy based on impedance matching network to achieve the optimal transmission efficiency. The simulation results show that the restraint effect of concrete medium on the transmission efficiency decreases gradually with the increase of the axial distance. The transmission performance is improved obviously due to the addition of impedance matching network. Finally, the correctness of theory is verified by experiments. It realized the optimization of the efficiency in concrete medium, and reduced the gap between theoretical research and engineering application.