In order to analyze the effect between output power and coil turns of the four coils model of magnetic resonant coupling wireless power transmission system, in this paper, the system model was established and the output power formula was calculated using the circuit theory. The output power curve of system was analyzed through the MATLAB software simulation. The result shows that the increase of the receiving coil turns make the system output more power than the increase of the transmitter coil turns when the four coils have the same structure and material. Meanwhile, the increase of receiving coil turns make the system frequency have obvious drop when the system reach maximum output power, and the frequency variation is not obvious when the increase of transmitter coil turns. The result also shows that when the receiving coil turns increase the peak load resistance of output power is also increasing. So when the four coils have same structure, the increase receiving coil turns can improve the output power.