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In domestic research of infrared carbon and sulfur analyzer are still many problems, because it is located in a very sensitive area in the infrared detector, the researchers domestic high-precision infrared carbon and sulfur sensor is an urgent need to a new level. The detection limit and detection accuracy to reach the international advanced level there is not enough of the sensor chamber technology, resource constraints detector and light source modulation signal behind other issues. Pre-filtered reason, the signal post-processing of the signals, of course, also exist. In this paper, current research status of infrared carbon and sulfur sensors, improving the signal to noise ratio method to explore and analyzed, and the corresponding solutions and concrete ideas.