As an information of combining RFID and wireless data communication technologies, internet of things is making things all over the world connected. RFID (radio frequency identification) technology is the most basic key technology in internet of things, which combines signal processing, wireless communication, embedded calculation and data management. RFID technology is being widely used in various areas, such as object tracking system, supply chain management, quick disbursement and so on. especially, deducing semantic relationships of objects in RFID applications has caught worldwide attention, such as inferring an event reminder "somebody lost things" according to the containtment-relationship of objects. however, there are rarely any concrete solutions applied to our practical life. in this paper, we study and implement and RFID based object-relationship recognition system to efficiently retrieve the group-relationship and contaiment-relationship between objects in real-time. finally, we give a real scenario to implement our research.