The invention relates to a charge message detecting alarming system and relative method, wherein the control computer via IP network is connected to account database, message database, message medium server, dial detector database, and alarm center computer; via detecting the whole process from sending message to answer message, it detects the state from message generation in charge center and the message delay in mobile phone to detect the message system, and alarm on time. The invention has bidirectional message transmission time detection and one-way message sending time measurement, database, delay wait time, etc, to detect message accidence and alarm on time.