Wireless passive sensors can be used for parameter measurements of the fast moving or rotating objects with advantages of wireless and passive sensing. A simple structured wireless passive surface acoustic pressure sensor was studied and designed based on the SAW technology and radio frequency technology. The sensing information of SAW pressure sensor was received based on CC1101 RF module. The transfer function of the impedance matching network of the CC1101 RF transceiver modules was derived, and the component parameters of the matching network were also determined successfully by MATLAB and Multism software, realizing tunable operating frequency of the RF module. A prototype sensor was designed and implemented. Test result showed that this sensor had the features of high accuracy and good stability, providing the basis for practical engineering applications.