Introduction to Qihe: Qihe, also known as Qiqu, is a small artificially dug canal. According to "Chang'an Chronicle" quoted from "Kuo Di Zhi": "The lacquer canal was opened by Hu Hai when he built the Epang Palace to transport lacquer from Nanshan." From this, we know that the canal was dug in the first year of the Second Emperor (209 BC). The reconstructed Qihe River was excavated based on relevant historical data, with a length of 298 meters, a width of 5-11 meters, and a water depth of 1.6 meters.