Magnetic resonance coupling wireless transmission technology is a topic at the forefront in the field of power transmission . The technology enables power transmission by highfrequency magnetic resonance coupling. High frequency magnetic field is the media of realization of wireless power transmission. Mutual coupling coefficient between coils transceiver affects the transmission efficiency and the transmission distance of the system directly. Space field strength synchronous detection is the most direct way to accurately analyze mutual coupling coefficient. A highspeed, wideband sample holder is the key to achieving high spatial frequency magnetic field strength synchronous detection. From the principle of the sample holder of ,the paper analyses of the impact of different operating modes and capacitance material within the sample holder to the performance of the sample and hold amplifier circuit in detail. Moreover, the paper discusses the spatial highfrequency magnetic field signal characteristics and requirements of the sample holder. On this basis,we designed a highspeed sample holder. In addition, we analyzed its performance under different experimental models in detail.