Abstract: The pitch models play an important role in speech recognition and synthesis. Most models in using are extracted by linguistics experts, some of which are described qualitatively and of low precision. To acquire more accurate prosodic rules, clustering analysis and decision tree are employed to extract prosodic rules from actual speech, and the result is encouraging. This paper introduces prosodic rules, clustering analysis and decision tree firstly, then each stage of the process is discussed in detail, finally experiments are given.