From the middle of the Ming, as the constrution, making charcoal, smelting, destruction of wars and opening up wasteland by destroying to forest, a heavy destruction was encountered by the forest reserve of the mountain area of the Haihe River valley.

• 明中叶以后,北京城的营建、烧炭、冶炼、战争破坏、滥建寺庙塔观及毁林开荒等,致使这里的森林资源遭到毁灭性破坏。