Abstract: Maritime transport is often affected by high temperature, high salt and high humidity environment, especially for valuable and precision cargoes, which are prone to damage risk during transportation. Therefore, it is important to establish a cargo communication monitoring system for improving the quality of marine transportation. In this paper, a maritime transport monitoring system based on BeiDou Navigation Satellite System (BDS) was designed, which combined the internet of things technology and BDS to achieve the real-time monitoring, navigation, positioning and communication functions of cargo. Taking the transportation of multiphase flow meter as an example, the realization method of the system function was described in detail. The system can be used as an industrialized assistant tool to reduce the cost of cargo damage and improve the efficiency of transportation management.