Comparing with the previous research, the paper expands study to the situation of single retailer and multiple competitive manufacturers, and the competitive manufactures supply products for the retailer that plays the dominant role in the channel system. The manufacture's product demand is influenced by competitor's marketing efforts as well as by one's marketing efforts. In this case, the paper studies the channel promotion behavior and influence factors under the conditions of both the horizontal cooperative promotion and the vertical cooperative promotion and makes some conclusions.