永乐城是宋夏战争期间由北宋方面修筑的一座具有重要战略意义的军事城堡。它兴修于宋神宗元丰五年(1082),位于宋夏边界的东段即今陕北境内的横山一带。这是北宋在对西夏的战略进攻阶段,实行先期收复横山,以削弱西夏实力的重要战略措施之一。由于永乐城的军事地理位置对宋夏双方都非常重要,故北宋修筑此城时,立刻引发了一场宋夏间互相拼死争夺的大战,即著名的永乐之战。这场战争,在宋夏战争史上影响深远,也一直为古今史学界所重视。但该城的具体位置,却因时代久远,在认识上仍存在着较大分歧。目前主要有两 Yongle City is an important strategic military castle built by the Northern Song Dynasty during Song and Xia Wars. It was founded in Song Dynasty Emperor Shenzong Yuen Fung five years (1082), located in the eastern boundary of Song Xia that is now within the territory of Northern Yanshan. This is one of the important strategic measures of the Northern Song Dynasty in the stage of strategic offensive to Xixia and the early recovery of Yokoyama in order to weaken the strength of Xixia. As the military and geographical location of the city of Yongle Song and Xia are very important to both sides, so when the Northern Song Dynasty to build this city, immediately led to a desperate battle between Song and Xia, namely the famous Battle of Yongle. This war, far-reaching in the history of the Song and Xia wars, has also been valued by ancient and modern historians. However, due to the long history of the specific location of the city, there are still major differences in understanding. There are two main present