摘要：Recently many accelerator parameters are measured by using the digital technology.A data acquisition circuit board adopting software radio technology has been *** this circuit board and RF front-end produced i-tech company one can comprise the BPM system.A bunch length monitor composed of the circuit board,power splitter, mix,and band filter has been examined for the bunch length measurement of *** data acquisition circuit board can be further improved,for example,the Ethernet can substitute VME;direct high frequency sampling can substitute medium frequency sampling;using large *** will further improve the performance of the data acquisition system,and be the goal of developing this system in the future.