With the development of science and technology, social progress and automated engine room of the ship is facing a technical change to fieldbus-based control system will gradually replace the existing distributed, distributed, local area network control of the ship's engine room automation control system . Now no one on the ship's engine room, engine room monitoring system for a long time to run, must overcome a number of special operations at sea, so the cabin surveillance systems require high reliability, real-time, earthquake, etc.. For this reason, to put forward a CAN fieldbus-based warning system to monitor the cabin of the ship's design. Fieldbus for the characteristics of this paper has been set up by the top management of computers and smart spaces under the node composed of the ship's engine room monitoring system network framework. And the next bit of intelligent nodes for the design of hardware and software for on-site monitoring of key parameters. Key words: Monitoring alarm system, CAN, ship cabin, single-chip