This contribution presents a detailed petrographic and mineralogical study of triphylite from the wall zone and coarse- grained spodumene- muscovite- quartz zone (intermediate zone) of No. 90- 1 spodumene pegmatite at Dahongliutan, Xinjiang. Triphylite occurs as dendritic or rounded aggregates in the pegmatite. Electron probe micro- analyzer (EPMA) and laser ablation- inductively coupled plasma- mass spectrometer (LA- ICP- MS) were used to determine the concentrations of major and trace elements in triphylite. Our results show that, besides major elements P, Fe, Mn, and Li, the triphylite contains subordinate Mg, Ca, and Zn. Moreover, HFSE and REE concentrations of the triphylite are extremely low. Integrating the EPMA and LA- ICP- MS data, our study indicates that the triphylite has been partially oxidized and that its composition has evolved towards ferrisicklerite. From the wall zone towards the intermediate zone, the triphylite shows decreased Mg and Zn contents but becomes relatively Mn- enriched as the Mn/(Mn+Fe) ratios of triphylite increase from 0.388 to 0.409. Such a compositional evolutionary trend is consistent with the typical Mn- Fe fractionation trend in many pegmatites according to the literature. Similarly, the columbite- group minerals in the same pegmatite show increasing Mn/(Mn+Fe) ratios at early stages. In addition, the triphylite is partially replaced by fluorapatite, which suggests that the activities of Ca and F increased at the late hydrothermal stage. This suggests that triphylite has potential to document magmatic and hydrothermal evolution of pegmatites.