It is very important to improve the predictive precision of reheated vapour temperature for enhancing the economy and reliability of the generating unit in power station. However, precise mathematical model is hard to build by traditional methods and model's predictive precision isn't high enough because the reheated vapour temperature is under the influence of many factors. Chaotic theory supplies a new method to solve the problem. In this article, the chaotic dynamic performance of reheated vapour temperature is revealed. Chaotic performanc...