Coconut milk is an oil-in-water emulsion formed from the aqueous extract of coconut solid endosperm. Although temperature will help extend the shelf life of coconut milk,but high heat can cause protein degradation and impair texture as well as stability of coconut milk. Therefore it should be improved its quality by using surface active stabilizer to prevent distability in coconut milk. The thermal treatment should be a deep freezing, freezing, chilling, control, moderate heating, intense heating and autoclaving. this research were measurement particle size determination, visual appearance and thermal analysis. Surface-active stabilizer also used in coconut milk in this research were sodium caseinate, whey protein, sodium dodecyl sulfate and Polyoxyethylenesorbitanmonolaurate.The results were found that the most suitable surface-active stabilizer used in treated coconut milk was sodium casienate.