The government of Song Dynasty set up duting posthouse,duting west posthouse,tongwen posthouse,libin posthouse,huaiyuan posthouse as Central Accommodation for Guests in the capital,which were used for accomodating those nationalities coming from border land and foreign countries.

The main economic causes of poor coal mine production safety are insufficient input costs,"the collusion between bureaucrats and coal businessmen",production beyond its production ability,failure of supervision responsibility,serious power-money trade,etc.