通过对一种再热汽温系统的分析，针对大滞后再热汽温系统，在对ＰＩＤ算法进行分析的基础上，提出了智能积分的改进措施，并对系统的实际投运进行了几点改进，包括定值偏置、一种自动情况下的调节器跟踪，变化比例带及积分时间。通过利用Ｔ６４０控制器的实现，效果良好。 Based on the analysis of a reheat steam temperature system and the large delay reheat steam temperature system, based on the analysis of the PID algorithm, the intelligent integral improvement measures are put forward and the actual operation of the system is carried out. Improvements include setpoint offsets, an automatic regulator trace, variable proportional band, and integration time. Through the use of T640 controller implementation, the effect is good.