Abstract: When triethylene glycol is used for dehydration, the inorganic salt retained in it is one of the main factors influencing the property of triethylene glycol. In this paper, by means of directly adding inorganic salt into the triethylene glycol, the minimum sedimentation concentration of inorganic salt in triethylene glycol is diagnosed, and the inorganic salt concentration affecting the rheological property of triethylene glycol and the effect of inorganic salt on the regeneration temperature of rich triethylene glycol are analyzed. The results show that the sedimentation concentration of single inorganic salt in triethylene glycol is related to the solubility of the salt in water and the water content of triethylene glycol. When a variety of inorganic salts are mixed, the minimum concentration for the sedimentation to occur in triethylene glycol is related to the type and mixing ratio of inorganic salts. The minimum concentration of inorganic salt affecting the rheological property of triethylene glycol is much higher than the minimum concentration for inorganic salt to settle.