Yuanling Yishan is a tomb, 20 kilometers around the tomb area. The old Tang book Linghu Xuan Zhuan said: "After the German Zong came to power, he had established the system of the Yuan tomb of the Dai Zong, which was extremely good, and when the money was used. Against the opposition of the orphan, Dezong followed it and had to be buried frugally." It can be seen that the system of the Yuan tomb bedding is not as good as the first emperor. It reflects the political and economic decline since Tang's "Anshi Disorder".