A multimedia messaging system and method for controlling message procedures. The multimedia messaging system comprises: a database for storing data on message procedures, wherein the data on message procedures are used for defining procedures for messages of various classifications and modes of transmission for each of the procedures; a feedback receiving sub-module for receiving sending results and feedback messages sent by message receivers; a time control sub-module for setting a scheduled processing time for each of the current messages; a message status determination sub-module for determining statuses of processing of the second messages; a message procedure control sub-module for selecting next procedures and setting the next procedures as respective current procedures; a message sending processing sub-module for obtaining data on controlling procedures and first messages, and for generating the second messages, wherein the second messages comprise message classifications, processing steps, first message contents, clients, transmission mode codes and client addresses; a message sending module for selecting modes of transmission according to information on transmission modes in the second messages, and for sending the second messages to corresponding message receivers.