Traceability systems gain more attention in worldwide as an effective method for controlling agricultural products and food quality safety. The concepts of traceable and traceability system were discriminated. Key technologies for establishment traceability systems, such as coding and identification, real-time record keeping in the supply chain, intelligent decision making and early warning and data exchange and query, were summarized. Combined IOT（internet of things） technology, the technology framework of traceability system including one kernel, two axes and three chains was constructed. One kernel means to implement the goal of agricultural products and food quality safety traceability. Two axes are the supply chain from farm to table as the horizontal axe and the IOT technologies from information sensing, information transmission to intelligent decision as the vertical axe. Three chains include products chain for supply lifecycle, service chain for supply chain actors and technology chain for IOT. Furthermore, the urgent problems for implement the traceability system were put forward, which included unified encoding, low cost and quick information collection equipment, application system with intelligent decision model and collaborative traceability platform.