Abstract: PTSOis abbreviated from di-P-tolyl Eolphoxide having a>S=0 group and is a neutral extractant.We have studied the behaviour and conditions of the separation of Au(Ⅲ) from other elements on a column packed with the silica gel loaded with PTSOand have found that PTSOis a new stationary phase with extremely high selectivity for the separation and concentration of gold.However, the application of PTSOto the solvent extraction has not bean reported yet.We first studied the behaviour and mechanism using PTSOto extract gold by atomic-absorption spectrophotometry, ultra-violet spectrophotometry and infra-red spectrophotometry.The possible structure of the extractive formed from PTSOand Au(Ⅲ) is suggested.