由于拖曳线列阵很长，工作频率很低，用常规的自由场方法是很难对其进行校准的。本文提出了一种在密闭管中测量线阵的自由场复数灵敏度和指向性图的方法。已经开发了一个初型校准系统，系统的频率范围从２０Ｈｚ到６００Ｈｚ，管中所得的测量结果与理论曲线符合很好。因此，线列阵管中校准方法是一种在低频情况下校准线列阵的十分有效的方法。 Due to the long array of towed lines and low operating frequencies, it is difficult to calibrate them using the conventional free-field method. In this paper, a method of measuring the free-field complex sensitivity and directivity map of a linear array in a closed tube is proposed. An initial calibration system has been developed with a system frequency range of 20 Hz to 600 Hz. The results obtained in the tubes are in good agreement with the theoretical curves. Therefore, the alignment method in a linear array tube is a very effective method of calibrating a linear array at low frequencies.