The paper discusses the application principle of standby database of railway dispatching system,introduces two kinds of back-cutting from major database to standby database,compares their merits and defects,puts forward new back-cutting method on the basis of background back-cutting method,summarizes the application demands of new back-cutting method,which will be good for guaranteeing normal operation of the railway dispatching system.%论述了铁路调度系统中备用数据库的应用原理，介绍了主用数据库向备用数据库倒切的两种方式，对比分析了前、后台倒切方式的优劣点，并提出了一种基于后台倒切的新的倒切方式，总结了这种新的倒切方式的应用要求，有利于保证整个铁路调度系统的正常运转。
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