Abstract:This paper analyzes how the forecasting information sharing of the retailers influences the supply chain which exist the consumers’ green preference and the manufacturers’ horizontal competition. It establishes to solve the four information-sharing model (no sharing, share only with high green cost manufacturers, share only with low green cost manufacturers to share and share with the two manufacturers). The results show that the retailers will loss if they want to take the forecasting information sharing, but it can make the manufacturers increase their forecasting profits. It also shows that the value of supply chain members under the information sharing and their preference to information-sharing mode not only depend on the level of manufacturers’ competition and the differences of their market share, but also by the constraints of the manufacturer’s green cost coefficient.