Abstract: Quality and price competition of products in different channel which affected by quality decisions of e-commerce platform and physical stores is considered. And product quality control problem in dual channel supply chains, which consists of manufacturers, retailer, e-commerce platform and customers based on the stackblerg game mode is studied. Considering the uncertainty of customer demand, the variation of the product quality level and supply chain's profit with coordination of wholesale price contract between manufacturers and retailer, revenue-sharing contract between manufacturers and e-commerce platform is analyzed, based on the benefit analytical models of manufacturer, physical store and e-commerce platform. Also, the optimal quality control levels of the manufacturers retailer and e-commerce platform are proved by using the principle of optimization. After the simulation, the result shows that the quality levels of the manufacturers, retailer, e-commerce platform are interacted with the contracts. The logistics distribution quality level of e-commerce platform and storage quality level of retailers change in the same direction, while increase in the price of retailer will be bad for the improvement of logistics distribution quality control. The more sensitive the consumers are to price, the more attention the manafacturer pays to product quality control. The more sensitive the consumers are to storage and logistics quality, the less attention the manufacturer pays to product quality control. So, the quality control in the production-process and physical stores can be promoted with the quality control of logistics and distribution services, which can be improved by the development of the logistics and distribution services.

Key words: demand uncertainty, dual channel supply chains, quality control