Abstract: A digital BPM signal processor prototype has been developed in Shanghai Synchrotron Radiation Facility （SSRF）, which is based on FPGA and ARM. In this paper, the processor progress was introduced, including the processor structure, key innovation, performance evaluation and future plan. It is the first BPM signal processor developed in China. Some essential technical breakthroughs were made during the development, and it can reach sub-micrometer position resolution, which is the same level of international product. The second version processor prototype was developed, and further system optimization is in progress.