Abstract: Using stearic acid and titanate coupling agent as composite modifier, the natural barite powder produced in Guizhou was modified by wet mechanochemical method. The effects of process conditions such as ball milling time, ball milling speed, mass ratio of ball to material, dosage of compound modifier, and mass ratio of modifier on the properties of modified barite were studied. The phase structure, morphological characteristics and coating of barite before and after modification were characterized by FT-IR、XRD、SEM、TEM and TG. The results show that the optimal process conditions are obtained through single factor experiments: the ball milling time is 2 h, the ball milling speed is 800 r/min, the mass ratio of ball to material (ball/barite) is 4 GA6FA 1, the dosage of compound modifier is 2.0% (modifier/barite), and the mass ratio of modifier (stearic acid/titanate coupling agent) is 2 GA6FA 1. After modification, the modifier was successfully chemically bonded to the barite surface. Compared with the unmodified barite, the average particle size of the modified barite is reduced, the dispersibility is enhanced, and the crystal structure does not change significantly. The modified barite's contact angle changes from 39.07° to 150.95°, and the solid surface free energy changes from 18.62 mJ/m² to 0.72 mJ/m². The modified barite has better superhydrophobicity and can be used as a raw material for preparing superhydrophobic coating materials.