In the past, it was believed that Xinzhou(信州) in the Liao and Jin dynasties was located in present-day Qinjiatun, in Gongzhuling City, while the ancient site in Wujiazi, 13 km to the west of Qinjiatun, was considered to be a sub-state of Xinzhou and received little attention. Based on the reading of historical satellite photos and field surveys, we have discovered the outer city wall around Wujiazi, thus increasing its perimeter to be comparable to that of Qinjiatun. This discovery is different from the old understanding. By re-evaluating the surface remains of the two cities and the excavated relics, it is clear the ancient city of Qinjiatun was a Jin dynasty site, while the ancient city of Wujiazi was a Liao dynasty site, abandoned in the early Jin dynasty. Based on the archaeological evidences and combined with the literature, we believe that the Liao Dynasty Xinzhou was ruled from Wujiazi ancient city, and during the Jin Dynasty Xinzhou was ruled in Qinjiatun ancient city. According to the Yuan Yitong Zhi, the time of the change seems to be the third year during the Huangtong period (1143).