Abstract: Chemical demulsification process was studied by using Turbiscan Lab® Expert stability analyzer，which revealed the phenomena of flocculation，coagulation，sedimentation，creaming and phase separation during the demulsification process. Simultaneously the rate of the above-mentioned phenomena and the droplet size changes were quantitatively analyzed. Results showed that flocculation and coagulation of water droplets occured in the middle of the W/O model emulsion，while kept stable in the middle of the O/W model emulsion. Moreover，creaming and sedimentation were observed in the top of the W/O model emulsion and in the bottom of the O/W model emulsion while other parts kept stable. As the demulsification process proceeds，the mean water droplet diameter in the middle of W/O emulsion increased from 29.07 μm（0 h）to 73.17 μm（1.8 h），while the mean oil droplet diameter in the middle of O/W emulsion increased from 12.95 μm（0 h）to 14.03μm（1.6 h）.