Wireless power transmission (WPT) based on the magnetically-coupled resonant is a hot topic in the research and development in modern electrical technology. It is the most likely to be a technology to provide solutions for wireless power supply of electrical equipment, such as household appliances, various consumer electronic products, smart wearable devices and embedded medical devices. The WPT is a flexible access and transmission for real-time power supply. In order to get rid of the shackles of the traditional power cord, the limitation of the space and distance of the power supply mode is solved. Using coupled-mode theory, the two identical helical coils are built with the height of 20 cm, the diameter of 60 cm and the number of turns of 5.25. Both coils are made of hollow copper wire. The expected resonant frequency given is 7.65 MHz, which is about 4.5% off from the measured resonance at 8 MHz. Control the class E power amplifier(PA) gate with an 8 MHz square wave signal, The effects of the nonlinear and linear shut capacitance have been considered in the drain of PA, it is important to predict the performance when an external capacitor is necessary to add for the optimal Class-E mode. Impedance matching is designed to maximum the power transfer from the drain of PA to the transmission coil. The system achieves the maximum transmission distance of 6 meters on the theoretical basis of the transmitting coil of diameter of 60 cm. According to experimental analysis, the system has a great improvement in transmission distance.