The six chisung were constructed between Heunginmunʼs south and Gwanghimunʼs north from King Yeongjo 29th February to June. Hongbonghan was planned to construct four chisung in consider of wealth of Yeoyeongchung. but six chisung were constructed. Three chisung among them was excavated recently. There were two chisung between heunginmun and third chisung. First chisung was between Heunginmun and Ogansumun, second chisung was between Ogansumun and Igansumun. And there were three chisung between third chisung and Gwangheimun. Forth chisung among them was on present Hanyang industrial high school, site of froth chisung was founded on a land registration map of the Japanese colonial period. There was two method to construct chisung. First method to construction chisung is to link fortress and chisung in no rebuild. Second method to construction chisung is to rebuild connection of fortress and construct chisung. The state of connection shows how to construct chisung. Second method to construct chisung is strong because of their cross-link of stone. Second method to construct chisung was used in King Yeongjo.The supervision was eoyeongdaejang Hongbongghan who suggest construction of chisung. And a field overseer was Jeonunsang who was beoljand of eoyeongchung. Hongbonghan was received well raised horse and Jeonunsang was promoted to Gyodongsusa for contribution of construction. And officers in charge of construction was contributed. Master craftsmans and mogun were mobilized. There were 440 persons to construct. Maybe master craftsmans were stonemasons to construct chisung. And mogun was laborer. They received yo and po for payment.