High-temperature electrochemistry (HTE) plays an important role in basic industries, including metallurgy and energy and future frontier technologies such as deep space exploration and carbon neutralization. At present, traditional research methods based on ex situ, macroscale characterization, and theory analogy with room-temperature electrochemistry cannot meet the demands of researchers. In situ characterization techniques can monitor real-time information, which can establish a full spatiotemporal, multidimensional, cross-scale methodology with the support of theoretical calculations, numerical simulations, and so on. It is hence of urgency to summarize and outlook the in situ characterization techniques and analytical methods of HTE. This review focuses on the in situ characterization techniques in HTE and points to a future direction in order to construct a methodology for HTE research. We therefore call on more researchers to enter the field of HTE in order to drive HTE engineering to realize low-carbon, high efficiency, refinement, and intelligence.

高温电化学（HTE）在冶金、能源等基础工业以及深空探测、碳中和等未来前沿技术中发挥着重要作用。目前，传统的基于异位、宏观表征以及与室温电化学理论类比的研究方法已经不能满足研究者的需求。原位表征技术可以监测实时信息，可以在理论计算、数值模拟等支持下建立全时空、多维、跨尺度的方法论。因此，当务之急是对现场情况进行总结和展望。HTE 的表征技术和分析方法。本综述重点关注HTE 中的原位表征技术，并指出了构建 HTE 研究方法的未来方向。因此，我们呼吁更多的研究人员进入HTE领域，推动HTE工程实现低碳、高效、精细化、智能化。