周期跃变(Glitch)是脉冲星自转过程中至今无法准确预测的自转突然加快现象。自周期跃变被发现以来，它被认为是了解中子星磁层和内部结构最重要的手段之一，因而被广泛研究。尽管非常重要，但除了观测样本数量的增加，理论上没有太大进展。而且最近几年国内外对周期跃变的观测研究也较少，这主要是受限于观测设备。本项目利用目前世界上观测性能最好的FAST和Parkes射电望远镜，将对FAST新发现的源以及一些旧的脉冲星源进行跟踪观测。通过此前利用Parkes望远镜的观测数据处理，我们新发现约30次周期跃变，并积累了观测经验。在本项目中，我们将继续采用脉冲星预处理和计时分析软件Psrchive和Tempo2处理数据，发现新的周期跃变，建立FAST脉冲星周期跃变星表；开展脉冲星周期跃变种类的小类划分；探索周期跃变的微观物理机制和跃变前的征兆。这些工作都有助于充分利用FAST的优势资源和促进中子星研究。

Glitch is a sudden acceleration of pulsar rotation, which can not be predicted so far. Since the discovery of Glitch for the first time, Glitch is considered as one of the most important method to understand the magnetosphere and internal structure of neutron stars, so it has been widely studied. Although very important, there has been little progress in theory except for the increase in the number of observation samples. In recent years, there are few studies on the Glitch in the world, which is mainly limited by the observation instruments. In this project, FAST and Parkes radio telescopes with the best observation performance in the world are used to track and observe the newly discovered pulsars of FAST and some old pulsars. Through the previous data processing of Parkes radio telescope, we have found about 30 Glitches and accumulated some observation experience. In this project, we will continue to use the pulsar pre-processing and timing analysis software Psrchive and Tempo2 to process data, searching new Glitches, establishing FAST pulsar Glitch catalog, carrying out the classification of pulsar Glitch types, exploring the micro physical mechanism and Glitch precursor. All of these work will help to make full use of the advantages of FAST and promote the research of neutron stars.