Abstract: Ecandrewsite was first discovered in North Mine deposit of Broken Hill, Australia, and has since been found in minor quantities in other deposits worldwide. However, comprehensive reports on this mineral remain scarce, with limited research on its chemical compositions and genetic geological process. In China, ecandrewsite was first identified in Lianyunshan pluton of northeastern Hunan Province. Through detailed field geological survey, petrographic observation, and electron probe microanalysis(EPMA), the paper studies its chemical characteristics and geological formation processes systematically. The ecandrewsite is occurred in the pegmatite dikes around the Lianyunshan granite pluton, with the primary chemical components of TiO₂, ZnO, FeO, and MnO, presented as the isomorphic solid solution mineral containing Fe, Mn, and Zn. Combined with the geological conditions, it is considered that the formation of ecandrewsite is closely related with the hydrothermal-pegmatitization in the late magmatic stage. The discovery of ecandrewsite not only enriches the basic regional geological data, but also provides new insights into understanding the geological evolution and metallogenic mechanism of rare metals such as Nb and Ta in the area.