In recent years, Block chain has received increasing attention and numerous applications have emerged from the present technology.A renowned blockchain application is the cryptocurrency bitcoin, that has not only been effectively solving the double-spending problem but also it can confirm the legitimacy of the transactional records without relying on a centralized system to do so.Therefore, any application using blockchain technology as the base architecture ensures that the contents of its data are tamper-proof.This paper presents decentralized Block chain technology approach to ensure that consumers do not fully rely on the merchants to determine if products are genuine.In this paper, describes a decentralized Block chain system with products anti-counterfeiting,in that way manufacturers can use this system to provide genuine products without having to manage direct-operated stores, which can significantly reduce the cost of product quality assurance.