Abstract: The swapping process between physical page and page file in a hard disk in the virtual memory architecture is a key factor that influences the context switches of thread scheduling.Based on the analyses of Zoned-Disk technology，an algorithm of optimized swap file reallocation has been proposed.Theoretical analyses and practical experiments show it takes obvious advantages over the traditional default methods not only in the Read/Write speed of page swap file but also in the efficiency of threads switching.Hence the performance of whole system has been improved.