The Serial Digital Interface is widely used in high sp eed uncompressed video data transmission.It's unsuitable to us e the clock recovered from original data as the reference clock, because the recovered clock has large clock jitter. It must have low enough jitter. Traditionally, offset compensation and drift compensation are used to achieve time synchronization.In this paper, a new mechanism to synchronize time by changing the Frame structure is carried out. This mechanism avoided introducing the extra hardware by changing the frame's structure.