北宋雍熙北伐失败以后，宋辽接着又进行了几次战争。宋太宗及群臣从战争的现实中逐步改变了对辽策略，终于从战略进攻完全转为战略防御，并采取了若干较为有效的防御措施。同时，又积极主动去谋求对辽和平。宋太宗对辽策略的重大转变，应予以充分肯定。本文在论述此观点的同时，亦意在纠正流行的对这一策略的否定看法。 After the defeat of the Yongxi Northern Expedition in the Northern Song Dynasty, Song and Liao went on several wars. Song Taizong and his ministers gradually changed their strategy toward the Liao Dynasty from the reality of the war and finally shifted from a strategic offensive to a strategic defense and took a number of relatively effective defensive measures. At the same time, they are also proactive in seeking peace with Liao. Song Taizong’s great change of Liaoning strategy should be fully affirmed. While discussing this view, this article also aims to correct the prevailing negative view of this strategy.