The invention provides a northbound interface management method and system. The system comprises an entry point management module which is used for providing an entry point for a third party application to invoke at least one management module in a corresponding notification management module, a file transfer module, a link monitoring module and an alarm management module, the notification management module which is used for ordering and unsubscribing notification messages, and sending, receiving and analyzing the notification messages, the file transfer module which is used for acquiring the file information of a northbound management agent NMA and transmitting the file information to a superior integrated network management system NMS, the link monitoring module which is used for sending a heartbeat message to the superior integrated NMS, and the alarm management module which is used for issuing a command to acquire an alarm list to the NMA and returning the file information of the alarm list to the superior integrated NMS. According to the invention, a unified physical exit is provided for a multi-standard network or device to realize butt joint with the superior integrated NMS; management and development costs are saved; and the method and system can dynamically support the adjustment of a subordinate northbound interface.