Rotating machinery is developing towards high speed, intelligentialize and high performance. In order to find early faults in time, it is necessary to develop a health monitoring system. Alarm storage is used to analyze the cause of alarm and is the core of the system. Aiming at the problems of cache time length changing with sampling rate, cache data loss, single alarm and so on in most system alarm storage, a method based on multiple shift multiplexing was proposed, which combined multiple shift registers, queues and cyclic indexes, and the method was realized by using LabVIEW platform. The experimental results show that this method can automatically store all data within 10 s before and after the alarm, and the problems of data loss, single alarm and so on are solved.