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In view of the current fire monitoring is given priority to artificial, poor real-time performance, alarm delay problems, on the basis of demand analysis, designs and realizes a kind of large area fire monitoring system based on embedded technology, GPRS technology in embedded hardware platform S3C2410 chip cooperate LM75A temperature sensors and related peripheral circuit, sensing temperature information collection and processing, using GPRS network of a wide range of various fire message data communication ability, and the software adopts the hierarchical design thought, the software design of the whole system is divided into user application layer, network integration, hardware driver layer three layers structure design, fire alarm in the form of using SMS to avoid the subjective strong artificial detection, the disadvantages of poor real-time performance. System test and a lot of actual data show, it can keep within 15% error rate, better than the traditional algorithm, the alarm accuracy increased by 27.4%, large area control in 1 square kilometers, alarm performance good, has the very strong practical application value.