1. The Silk Road is divided into several roads, such as North Road, South Road and Xinbei Road. Some pass through Yumen, and some pass through Yangguan, with the continuous diversion of politics and water. The route through Yumen is gradually abandoned.

2. The water source is exhausted, the ecology is deteriorating, the local political economy has promoted the change of the center of gravity of the box, greed and economy, and Yumen's status has declined.

3. The key point is that the withdrawal of Han Chinese forces from the Western Regions has reduced the defensive value of Yumen and left it unattended.

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1. The Silk Road is divided into several roads, such as North Road, South Road and Xinbei Road. Some pass through Yumen, and some pass through Yangguan, with the continuous diversion of politics and water. The route through Yumen is gradually abandoned.

2. The water source is exhausted, the ecology is deteriorating, the local political economy has promoted the change of the center of gravity of the box, greed and economy, and Yumen's status has declined.

3. The key point is that the withdrawal of Han Chinese forces from the Western Regions has reduced the defensive value of Yumen and left it unattended.