Abstract: A system and a method for promoting multi-layer forwarding messages are provided. An embodiment of the method for use in an advertisement server system includes the following steps. At least one feedback message is received, wherein each of the at least one feedback message includes a forwarding user identifier and a user identifier of a corresponding first receiving device, and the advertisement server system interprets the at least one feedback message as a first-layer forwarding of an advertisement message associated with the forwarding user identifier. The forwarding number of the first-layer forwarding of the advertisement message is stored according to at least one feedback message of the first-layer forwarding of the advertisement message. An encouraging message is sent to a forwarding mobile device of the forwarding user identifier, wherein the encouraging message includes information based on a forwarding weight is determined according to at least the forwarding number.