The forts of northwest trims the northern Song Dynasty constructed, not only were used to resist the attack of Xixia Dynasty and so on, but also to obvious commercial funtion.

• 摘要北宋在西池沿边修建的堡寨，除了用来抵御西夏进攻和招抚沿边蕃部的作用外，还具有明显的商业性质。