Abstract: Natural Gas Hydrate (NGH) development technology has become the frontier of scientific and technological innovation in the world. In the development of NGH resources, both safety development and environmental protection should be paid equal attention, in order to accelerate the commercialization of NGH production in the seabed, it is urgent to strengthen the long-term environment monitoring of seabed exploitation. This paper designs an environment monitoring and assessment system for NGH exploitation based on BeiDou Navigation Satellite System (BDS). By displaying the atmosphere, sea water, seabed and underground well of 'four in one' 3D visualization marine stereoscopic space scene, we can obtain the real-time data acquisition and remote transmission of NGH exploitation environment sensors, and realize the real-time safety analysis, tracking and warning function of exploitation environment in the seabed.