1. A cloud infrastructure-based management system for maintenance deployment of an application system, comprising: an application scheduling deployment engine, configured to perform application scheduling deployment according to a scheduling deployment policy of an application and performance of an application instance in the application or task processing state data of the application instance, and generate a deployment instruction for the application instance, wherein the deployment instruction comprises an application attribute and a range of attribute values; a deployment plug-in, configured to obtain the deployment instruction for the application instance from the application scheduling deployment engine and perform deployment configuration to the application instance; and a monitoring plug-in, configured to monitor performance or task processing state of the application instance, and transmit the performance of the application instance or the task processing state data of the application instance to the application scheduling deployment engine.