Puzhou is situated in the middle of Yellow River. People of Puzhou cross Yellow River though pontoon bridge, but their pontoon bridge was often destroyed by the waves. In order to solve this problem, iron oxen were made in Tang Dynasty. People riveted the pontoon bridge by using these iron oxen.
There are 8 iron oxen in total and 4 of them are excavated from the ground. These iron oxen are very huge and they all face to the Yellow River. What is more, iron pillars and iron men are all excavated with the iron oxen.