本文提出了在相位量化下的高精度定时综合理论，并基于Ｖｉｔｅｒｂｉ算法提出了一种最优合成方法．同时，还给出了基于ＴＶｉｔｅｒｂｉ的简化方法并对ＴＶｉｔｅｒｂｉ和二阶ＳｉｇｍａＤｅｌｔａＭｏｄｕｌａｔｉｏｎ（ＳＤＭ）方法进行了分析和性能比较．仿真结果表明这两种方法在量化精度上大大优于传统的一阶ＳＤＭ的方法．最后，本文给出了一个最优化算法在ＳＤＨ（ＳｙｎｃｈｒｏｎｏｕｓＤｉｇｉｔａｌＨｉｅｒａｒｃｈｙ）漂移产生中的应用实例． This paper presents a high-precision timing synthesis theory in phase quantization, and proposes an optimal synthesis method based on Viterbi algorithm. At the same time, a simplified method based on TViterbi is also given and the TViterbi and secondorder SigmaDeltaModulation (SDM) methods are analyzed and compared. The simulation results show that these two methods are much superior to the traditional first-order SDM in terms of quantization accuracy. Finally, an application example of optimization algorithm in SDH (Synchronous Digital Hierarchy) drift generation is given in this paper.