A new DBPM electronics system based on pilot tone is introduced in this paper to improve the traditional DBPM electronics system which is affected by the non-linearity of electronic channel, temperature drift and system noise.The hardware of the electronics consists of analog signal acquisition electronics, digital signal processing electronics and pilot tone combiner electronics. The software consists of application software and firmware.The beam signal and pilot tone signal are coupled in the pilot tone combiner, and then the combined signal processed by electronic hardware board, and finally calculated by FPGA(Field Programmable Gate Array) to obtain the normalized beam position information. The electronics was tested in the laboratory and it is shown that the normalized pilot tone can effectively educe the measurement variation with temperature of each channel. After normalization, the accuracy the channel changing with temperature is effectively improved. The beam position drift is improved from 4.5 μm to 0.5 μm, and the resolution is improved from 57.25 nm to 13.37 nm. And the pilot tone switching experiment can show intuitively the effect of the pilot signal on the beam position measurement of online correction. The design of DBPM electronics based on pilot tone can realize online correction of beam position measurement efficiently and in real time, and improve the real-time resolution performance of the electronics system.