Abstract: This is a paper in the field of process mineralogy. Dawudian crystalline graphite deposit is a extra large graphite deposit which located in the Langshan Mountain lying in the Bayan obo rift zone. To get some insight into the characteristics of Dawudian crystalline graphite deposit ore and its gangue minerals, this paper systematically studies the ore characteristics of Dawudian crystalline graphite deposit. Some modern analysis and testing methods were used. Such as X-ray diffraction analysis, rock ore identification, spectral semi quantitative analysis. The results show that: (1) The useful mineral of the ore is graphite, and the gangue minerals are mainly quartz, feldspar, muscovite, andalusite, pyrite, etc. (2) The maximum particle size of ore graphite flake is 2.5 ~ 3 mm, and the minimum is 0.001 mm, which is mostly concentrated between 0.01~0.05 mm. It is a fine flake microcrystalline graphite ore. (3) The fixed carbon grade of the main beneficial elements of the ore varies from 2.50% to 11.18%, generally from 3.00% to 7.00%, the average grade is 4.15%, the content of harmful components is 0.16%~4.23%, the content of P₂O₅ is 0.05%~0.79%, and the content of Fe₂O₃ is 3.89%~10.38%. The impurity minerals are mainly siliceous minerals and clay minerals. (4) The ore has no other comprehensive utilization value mineral except graphite.