Abstract: Effective sulfur is an important technical indicator in sulfur concentrate, and accurate determination of its content is of great significance. Traditional analysis methods have certain lag and limitations in guiding production. The experiment explored the determination and analysis method of effective sulfur in sulfur concentrate using a high-frequency combustion infrared carbon sulfur analyzer. The selection of the optimal measurement conditions for the instrument and the amount of sample weighed were tested. The optimal conditions were determined to be a sample weighing of 0.0500-0.1000g, a combustion temperature of 850℃ ,an instrument flushing time of 30 s, a combustion time of 80 s, a sampling delay time of 80 s, and an oxygen blowing rate of 2.0-3.0 L/min. The method is used for sample analysis, with a relative standard deviation (RSD, n=11) of 0.17% to 3.4%. The results are consistent with those obtained through traditional analysis methods.