Two types of supply chain dominant mode—manufacturer dominant and retailer dominant—were constructed，and two types of logistics mode—logistics outsourcing and self-logistics—were given． Enterprise decision making and supply chain stability are studied under four combinations: manufacturer dominant and logistics outsourcing，manufacturer dominant and self-logistics，retailer dominant and logistics outsourcing，and retailer dominant and self-logistics． It is found that: ( 1) The manufacturer’s and the retailer’s logistics strategies are related to the size of T /`T: if 1 ＜ T /`T ＜√2，then the manufacturer’s and retailer’s logistics strategies are both self-logistics，supply chain is stable; if T /`T ＞ 2，then the manufacturer’s and the retailer’s logistics strategy are both logistics outsourcing，and the supply chain is stable; if√2 ＜ T /`T ＜ 2，then the manufacturer's logistics strategy is inconsistent with the retailer’s，with the manufacturer＇s optimal logistics strategy being logistics outsourcing ( self-logistics) ，but the retailer’s being self-logistics ( logistics outsourcing) if the manufacturer ( retailer) is the dominant enterprise． ( 2) For the four combinations，if 1 ＜ T /`T ＜ √(12 /5)，then the manufacturer dominant and self-logistics( retailer dominant and self-logistics) mode is better than the manufacturer dominant and logistics outsourcing ( retailer dominant and logistics outsourcing) mode． If T /`T ＞ √(12 /5)，then the manufacturer dominant and logistics outsourcing ( retailer dominant and logistics outsourcing) mode is better than the manufacturer dominant and self-logistics ( retailer dominant and self-logistics) mode．