With mature radio frequency technology, can provide an unprecedented, nearly perfect for supply chain solutions. That is to say, the company will be able to timely know each item in their supply chain at any point in the location of the information. So how to identify and track each item in the supply chain? There are many ways to achieve, but we find the best solution is to give each a product the only number - "licence" - electronic product code (EPC). At the beginning of this decade, EPC is put forward by the MIT center for AUTO - ID, it is a very advanced, comprehensive and complicated system.