建立了一个关于最优价格、质量和广告策略的动态规划模型，通过模型的建立和此模型最优状态反馈控制的确定，寻求使产品的销售达到利润最大的广告投入、为提高产品质量的研究与开发投入和价格制定的最优策略。

In this paper,a dynam ical programming model for optimal price,quality and advertising policies is estab lished.Based on the model and determ in ing optimalstate feedback controls of the model,we seek optimal policies of p rice,investment is both advertising and R&D for im p roving quality for max imizing profit of sale.