Flash memory is a pure electronic equipment and has the advantages of smaller volume, faster reading speed, lower power consumption and strong vibration resistance, so it is used to partly replace the disk to improve the performance of storage system. But the existing design and optimization of buffer replacement algorithms are based on the physical characteristics of mechanical hard disk. Therefore, it is necessary to redesign a new buffer replacement algorithm which contrapose the physical characteristics of flash memory. This study presents a new buffer replacement algorithm named CF-ARC. A new type of page mechanism replacement is designed, which means the access frequency should be considered when the clean or dirty pages are replaced. The clean pages less visit should replace the buffer to improve the hit rate in hotspot and achieve a better performance. The experimental results show that CF-ARC has better performance than other buffer replacement algorithms in most cases.