【Abstract】The platform of intelligent messages alarm system in central air conditioning can capture the temperature and humidity data from INTOUCH monitoring system through DDE channel, then judge whether the temperature and humidity of the Precision measuring lab are abnormal through the parameters of alarm system.When the temperature or humidity is abnormal, the system will judge whether tosend message according to the GSM parameters and working time,at the sametime, send data to the PLC through MODBUS protocol, and the PLC will controlthe action of warning light and buzzer.