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激光器的频率漂移对相位敏感光时域反射计的定位有重要的影响，其直接导致定位的信噪比下降。提出一种频谱分析结合选取特征频段的定位算法，在算法中通过选取合适的特征频段，对影响系统定位的激光器频漂进行误差抑制。特征频段的选取通过实验信噪比的高低决定。通过实验验证，结果显示该算法提高了系统定位性能并进一步提高了信噪比。“,”In the distributed fiber-optic disturbance sensor system based-on φ-OTDR, the frequency drift of laser directly results in low signal to noise ratio (SNR) of the system and further influences system location. In order to reduce the disturbance location error induced by laser frequency drift, a location algorithm was proposed through analyzing the error mechanics, which combines spectrum analysis with characteristic frequency selection. The characteristic frequency for location was achieved by comparing the SNR of the system owing to different frequency. Laboratory tests were established and the results indicate that the algorithm is efficient to disturbance location for the location and the performance of system has been enhanced.