A new method which combines the Simplex code with the average superposition algorithm-S superposition algorithm is proposed . In the condition of the same denoising effect of the two methods, S superposition algorithm can substantially reduce the number of superposition to reduce the time of the signal processing and solve the problem brought by the length of Simplex code. In order to verify the correctness of the S superposition algorithm, create mathematical model of the distributed optical fiber sensing system. Simulation experiment is launched with the mathematical model. The results of the simulation experiment show that the S superposition algorithm can greatly reduce the signal processing time. It proves the correctness and validity of the new method.%本文提出了一种将 Simplex 编码调制去噪技术与叠加平均去噪技术相结合的方法-S 叠加算法。该方法是将S编码与叠加平均算法混合使用，在去噪效果相同的情况下，S叠加算法可以大幅度减少叠加次数，缩短了信号处理时间，同时，降低了随着Simplex编码长度的增加对信号解调带来的困难；对分布式光纤传感系统进行数学建模，并在此模型的基础上进行了数值分析，数据表明，S 叠加算法可以大幅度减少信号的处理时间，证明了该方法的正确性和有效性。
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