Abstract: Taking the samples of granite weathering crust ion adsorption rare earth deposits in Changting area of Nanling, Fujian and a place in northern Myanmar as the research objects, the geochemical characteristics, mineral characteristics, composition and content changes of rare earth in iREE deposits in the two areas are compared. The bedrock of weathering crust in both places is biotite monzogranite. After comparative analysis, it is found that the iREE deposits in the two places are obviously different in geographical location, altitude, structural background, weathering degree and other aspects, resulting in great differences in deposit attributes between the two places. The weathering degree in Changting mining area is higher, and the CIA index is as high as 92.07%, which may be the main reason for more clay minerals in Changting mining area, it is also easier to develop colloidal rare earths closely embedded with clay minerals such as psilomelane and kaolinite than in northern Myanmar; Although the weathering degree of northern Myanmar mining area is low, the preservation thickness of iREE ore body in northern Myanmar is larger, which may be that its geomorphic conditions are more conducive to the preservation of iREE - crustal uplift and surface denudation in northern Myanmar may be closer to the threshold, or there may be a more reasonable alternating interval of strong and weak erosion; iREE tailings formed after leaching of iLREE deposit is generally a clay material with low REE and stable chemical properties. From the perspective of comprehensive utilization, it is an important direction in the future to strengthen the development and research on the rare earth recovery process of low-grade refractory iREE tailings and realize the sustainable utilization of ionic rare earth resources.