Under the nowadays globalization's tendency, competition between the manufacturer is day by day intense, the risk management day after day is also taken by the human. This research's goal is take Stackelberg Game theory as an construction, manages affairs because of the conditional risk theory, the coordinate set price contract's fundamental mode, develops between the manufacturer and the retail merchant the set price contract decision-making support pattern, discusses the risk regarding the set price contract decision-making influence. When this research discovery has the risk management value consideration, its strategy result compares truly can withstand the actual market demand the change, obtains the big profit, then achieves reduces the business risk the goal. This research expectation can as the enterprise will schedule the set price contract decision-making support pattern when the future the reference.