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S: In the oil catalytic cracking workshop, the method of installing fixed sensors to detect the environmental state of the workshop is restricted by the installation position. Developing a safety patrol car combined with the original monitoring system will plays a direct and important role in reducing the probability of accidents in the workshop. A PLC based car is used as a carrier to carry multiple gas sensors and ZigBee communication modules. PLC and SCM combined to control the car"s automatic cruise. Using the EM235 module and the gas sensor to monitor the environmental conditions of the workshop, and the environment data is sent to the host computer through ZigBee to display in real time. When the measured concentration is greater than the warning value, start the buzzer and light alarm. The host computer uses C++Builder to design human-computer interaction interface. The experimental results show that the combination of the safety patrol car and the traditional monitoring system can better reflect the environmental state of the workshop and improve the monitoring efficiency.