In view of an improvement of the durability of PCM in the hybrid memory composed of PCM and DRAM, as well as a reduction of the page writing operation on PCM, a new formula is used to calculate the write weight value of frequency aging with the statistics of the write access frequency and the influence of the latest write access interval on the page writing heat and cold combined together, followed by a calculation of the hot and cold pages of the hybrid memory according to the latest write frequency and the calculated frequency aging weight. Based on the simulation analysis and comparison, it is verified that this proposed method helps reduce the number of PCM page writing.