Under the situation of highly competition among downstream manufacturers, this research establishes two game models composed of one supplier and two manufacturers under the circumstance of price flexibility strategy and price commitment strategy offered by the supplier separately. The equilibrium and optimal expected profits of all supply chain members are obtained by using backward induction. Meanwhile, this research analyses the impact of price commitment strategy on the creativity of innovative manufacturers, profits of supply chain members and expected profits of whole supply chains by comparing the equilibrium and optimal expected profits under two different strategies. On the basis of preview study, a revenue sharing strategy is designed, and it is verified that the compensation strategy can guarantee the supply chain members to achieve a win-win situation.