宋代從建國之初，對遼用諜即很積極，至雙方訂立澶淵盟約之後，兩國建立起和平的外交關係，也未鬆懈對遼用諜的工作。因此本文就此一史實做了一些探討，並且給予肯定的評價。

The sung was very positive in the spy work towards the Liao at the beginning of the Sung Dynasty. Even the treaty of alliance for the mutual parties was concluded and these two countries established the peaceful diplomatic relation, yet the espionage towards the Liao was not relaxed. This article thus does some research on the relative historical evidences and gives truly positive assessment.