A hierarchical recognition algorithm for optical fiber pre-warming system (OFPS ) based on stress reaction process is proposed.The algorithm is inspired by the mechanism of the body calling system and energy in stage when under stress,and we use the hierarchical algorithm for recognizing continuous invasi on.For the optical fiber vibration signal caused by the continuous intrusion event,the hig h recognition accuracy and high time consumption algorithm is used to identify the current int rusion event types in a short time.The following vibration signals are identified with low recogni tion rate and low time consumption algorithm to monitor whether the new intrusion event is gen erated.When the new intrusion is found,the signal will be re-identified by the high recognition rate algorithm.The experimental results show that the recogniti on speed of the algorithm is 3.67times faster than that of the complicated algo rithm while the recognition accuracy keeps the same level.Thus the requirements of real-time monitoring and high-accuracy recognition can be ensured simultane cously.