For the inherent characteristics of flash memory such as erase before write, the I/O overhead of reading and writing unbalance, and so on, studying the buffer management of flash memory has important theoretical significance and application value to improve access performance of Flash-based SSD (Solid State Disk, SSD). Analyzing of the key technologies of SSD and the existing buffer management algorithm, it has implemented a buffer algorithm used for SSD, which is based on the cluster of writing pages. The key technology and the principle of the algorithm has been described in detail, and the writing of SSD buffer management is implemented on basis of Flashsim platform. Compared the performances of traditional buffer algorithm and the new algorithm, it indicates that the buffer algorithm based on the cluster of write page can reduce the random write times and the data dispersion of SSD and improve the average response rate of SSD.