Application changing method and device

The embodiment of the invention discloses an application changing method and device so as to improve the efficiency and reliability of application changing and reduce the influence on service continuity. The method comprises the steps that based on a change plan for a target application, multiple change operations needing to be executed for changing the target application and an execution plan corresponding to each change operation are determined, and the execution plan at least comprises a change domain; respectively executing each change operation based on the execution plan corresponding to each change operation; in the execution process of the single change operation, obtaining operation index data of the service system based on the change domain corresponding to the change operation; performing situation awareness based on the acquired operation index data to determine whether execution of the change operation causes the business system abnormality or not; and if the execution of the change operation cau