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Infrared detection of low sulfur is a very important research field. However, because the absorption peak of infrared sulfur is in a special band and coincides with the infrared band of human body, most foreign advanced technologies are blocked from China, while domestic carbon sulfur sensors have the defects of cross absorption error, insufficient detection limit and low detection accuracy. Based on the measurement of sulfur in coal, this paper studies the above problems existing in the measurement of sulfur by using electrically modulated pyroelectric infrared sensor, mainly carries out the relevant improvement design and experiments to improve the signal-to-noise ratio of the sensor, such as detector stability, constant temperature test, gas chamber noise and filtering, and puts forward the optimization scheme. After optimization, it is tested by experiments, The signal-to-noise ratio of the whole test system is increased by nearly 50%, and the detection limit is increased from 100 ppm to nearly 10 ppm. The average value of low sulfur measurement is 0.382%, SD is 0.006%, RSD is 1.2%, and RSD in bottle is 0.9%. High precision test of low sulfur is achieved.