A harmonizing method for protection restoration between middle-level network in automatic switched optical network is disclosed. The method comprises: setting restoration delay initiating timer for all service connections; every network element in the network real time detects alarm status of all links and service connections, and at the same time, detects timing status of the restoration delay initiating timer; if detects there is a link failure, then the local network element that detects link alarm initiates local corresponding protection restoration, and then continues to detect alarm status and timing status; if detects there is a service connection alarm, then reroutes service alarm detected by source network element in the domain, and then initiates restoration delay timer, and continues to detect alarm status and timing status; if detects that the time of restoration delay initiating timer is end, then reroutes the source network element in the domain, and monitors original interrupted service again, if the alarm still exist, then initiates global restoration, and then continues to detect alarm status and timing status. The invention establishes complete protection restoration system for different network level, and the advantages of the invention are rapid and credibility.