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For the harmful gases leakage risk and safety monitoring problem for workers in production field, therefore, a safety monitoring system for petrochemical harmful gases based on GPRS is designed, introduced system architecture and the implementation method of software and hardware. Complete the hardware development and software design for personal portable safety detect instrument on the basis of STM32F103, including the functions of harmful gases concentration detection, pinpoint and GPRS wireless transmission and so on. Complete the software development of gas safety monitoring system by using the B/S structure, including technology architecture, function realization, software test and so on. According to the result of laboratory functional test and safety monitoring test in production field, the system has remarkable concentration accuracy, many functions, good stability and strong practicability and can be used in several fields, such as individual safety protection, accident emergency disposal, safety monitoring in dangerous site and so on.