Panmen is the only water and land city gate in China today. According to documents, King Zhou Jingwang's six years (514 B.C.) Wu King Helu ordered Wu Zixu to build the capital city of Wu State. Panmen was one of the eight gates of Wu State. There was a wooden dragon hanging on the door to show the deterrence of Yue State. It was called Panmen in ancient times. It is also named because of its-quot; half-edge buckling of terrestrial and aquatic facies-quot;.