A REE-bearing mineral, i.e., monazite, was discovered in the Ni-Mo ore from the Tian'eshan_Huangjiawan Ni-Mo sulfide layer of Zunyi, Guizhou Province, on the basis of electron microprobe analysis. The monazite is distributed as fine scattered particles and vermicular aggregates in the Ni-Mo ore, coexistent with Ni- and Mo-bearing minerals. High La and Ce contents (La2O3: 25.70%～30.52%, Ce2O3: 22.96%～27.68%) and low Sm and Th contents（Sm2O3: 0.49%～0.80％,ThO2:0%～0.19%）of the monazite show the characteristics of hydrothermal generated monazite.