This paper briefly reviews the research history of the welding process of volcanic pyroclastic materials both in China and abroad, sums up and explains the terms related to the welding process and, furthermore, discusses the textures and structures that occur in the process. In addition, the authors also try to summarize the welding mechanism of the pyroclastic rocks from both field investigations and indoor experiments and deal emphatically with the research significance, so as to arouse more attention to the pyroclastic materials in volcanic activities and related welding process among researchers in China, thus helping understand the volcanic eruption effect and rebuild the eruption history.