The present disclosure is related to the field of communication technologies and provides a method, system, and storage medium for message processing. The method includes the following steps: configuring, by an initiator, a serial number for a message, and sending the message having the configured serial number to a target end; extracting, by the target end, a serial number of a message that a user chooses to reply to, and adding the serial number to a corresponding reply message; and displaying, by the initiator according to the serial number carried in the reply message, the reply message next to a message corresponding to the serial number carried in the reply message. In the present disclosure, the serial number is configured for each message, and the reply message is displayed next to the corresponding message according to the serial number carried in the reply message, thereby improving pertinence between a reply message and its original message.