Abstract: Chlorine (Cl) in coal is a typical hazardous associated element; during combustion and thermal conversion, HCl and other chlorine-bearing gases are readily released, inducing high-temperature corrosion of heat-transfer surfaces, deposition of chlorine salts, and formation of chlorinated organic pollutants. Chlorine contents in coals from the Kumtag coalfield, Xinjiang, are markedly elevated, whereas systematic understanding of Cl enrichment and oc-currence modes remains insufficient. The enrichment and occurrence modes of Cl in major coal seams of the Kumtag coalfield at depths of 410 m (KMTG-1), 460 m (KMTG-2), and 520 m (KMTG-3) are systematically in-vestigated using ion chromatography, sequential extraction, X-ray photoelectron spectroscopy (XPS), Brunau-er–Emmett–Teller (BET) specific surface area analysis, X-ray diffraction (XRD), and X-ray fluorescence ?spec-troscopy (XRF). The total Cl mass fractions of the three coal samples are 1.18%, 1.69%, and 1.58%, with an aver-age of 1.48%, classifying them as typical high-chlorine coals. In all three samples, Cl occurs predominantly in in-organic forms, accounting for 88.16%, 87.57%, and 84.18%, respectively; XRD results identify NaCl as an im-portant carrier of inorganic chlorine, whereas organic-bound Cl accounts for 11.86%, 12.43%, and 15.82%. Cl en-richment is also closely related to the mesopore structure: the total specific surface areas are 1.949, 2.126, and 4.125 m2/g and the total pore volumes are 0.0121, 0.0088, and 0.0195 m3/g, providing pore space for chlo-rine-bearing fluids and Cl enrichment. KMTG-2 has the smallest average pore diameter (16.6 nm) and the highest Cl mass fraction (1.69%), whereas KMTG-1 has the largest average pore diameter (24.9 nm) and the lowest Cl mass fraction (1.18%). These results reveal the occurrence modes and enrichment of Cl at different depths in the Kumtag coalfield and provide a theoretical basis for the clean utilization of high-chlorine coal in Xinjiang.