The present invention discloses a method and a system for resending messages with a minimized number of retries and maximized timeliness of delivering the message to the receiving party. The method sets a retry period for a message that needs to be resent, determines a retry time according to the retry period, and sends the message after the retry time is reached. The retry period increases as the number of retries increases. The method and the system can ensure reliable delivery of notification messages and support many transmission protocols between different systems, does not require the receiving party to implement complicated interaction protocols to reliably receive a notification message, and is suitable for widespread use in the Internet. Moreover, the disclosure supports multiple transaction processing, can be used as a common business transaction application platform, and allows flexible expansion of multiple transactions and multiple protocols.