Dasi deposit is located in the middle of the Mesozoic Daxinganling- Yanshan volcanic belt, and it has great prospecting potential for porphyry and epithermal deposits. This area is recognized as an important metallogenic belt, characterized by extensive magmatic, volcanic, and subvolcanic activity. In our study of the Dasi deposit in Inner Mongolia, we utilized SWIR and TIR technology to measure rocks from the surface and cores. With the assistance of mineral geochemical analysis and microscope observation, we successfully completed the alteration mapping and prospecting potential prediction. The results show that: ① The main altered minerals at Dasi deposit include albite, microcline, quartz, sericite, kaolinite, montmorillonite, and chlorite, along with smaller amounts of alunite, tourmaline, gypsum, and biotite. ② The relationship between the identified alteration minerals through SWIR analysis and the Pb orebody shows a close association between mineralization and tourmaline, alunite, kaolinite, and sericite. Dasi deposit exhibits mineral assemblages typical of medium- sulfide epithermal deposits. ③ Pb mineralization dominates the deposits, mainly occurring at shallow depths of around 300 m underground. The exposed surface shows significant denudation, and the bottom plate of the Pb orebody is composed of argillization minerals, predominantly montmorillonite and chlorite. The alteration zoning, progressing from the mineralization center outward, follows the sequence of sericitization→sericite+kaolinite (+alunite+tourmaline)→sericite+montmorillonite→montmorillonite+chlorite. The orebody is located within a sericite (kaolinite) alteration zone. ④ Long- wavelength sericite indicates the presence of deep- seated thermal energy, while short- wavelength white mica reflects a combination of magmatic hydrothermal solutions and external atmospheric precipitation. Wavelength shifts at 2200 nm provide insights into the metallogenic environment, such as pH, temperature, and fluid flow. ⑤ The absorption depth of sericite at 2200 nm demonstrates a positive correlation with Pb grade, as expressed by the equation y(Pbgrade)=0. 1217 x(absorption depth)(R2=0. 9178). A threshold of 10% absorption depth can differentiate between sericite and kaolinite mineral types. ⑥ Combined with GIS spatial overlay analysis, we determined that the peripheral areas still hold promising prospecting potential.