介绍了时间分辨原位同步 X射线衍射技术 (in situ TR XRSD)的原理。该技术以其原位测量性和时间分辨性为特征 ,广泛应用于分子筛研究的各个领域。举例阐述了该技术在水热合成条件的优化、结晶动力学参数测定、成核机理探索、转晶过程和机理、晶体参数变化的监测和骨架外阳离子迁移等过程研究中的应用原理和方法 The principle of time-resolved in-situ X-ray diffraction (in situ TR XRSD) is introduced. The technique is characterized by its in situ measurement and time resolution and is widely used in various fields of molecular sieve research. An example is given to illustrate the applied principles and methods of this technology in the optimization of hydrothermal synthesis conditions, the determination of crystal kinetic parameters, the exploration of nucleation mechanism, the process and mechanism of crystal transformation, the monitoring of crystal parameter changes and the extracellular cation migration