Abstract: The demand for intelligent safety helmets is applied at engineering sites, and has been valued by domestic and international users as automated instruments become more and more popular. BeiDou satellite positioning system (BDS) development technology has become the new highland of science and technology innovation in today's world. In order to accelerate the pace of commercial production of integrated intelligent safety helmet, it is urgent to strengthen the long term monitoring of the environment the operator works. This paper designs a system based on BDS, which can provide operator's environment monitoring and assessment. By showing carbon dioxide (CO) concentration, temperature, humidity, and the actual situation of the environment in which the operator works, the targeting and the monitoring data transmission of the operator's working condition can be realized. Also, real-time safety assessment of the working environment under different working conditions, trajectory tracking and disaster warning functions can be accomplished.