古代风俗，于农历三月上巳日(上旬的巳日，魏晋以后始固定为三月三日)就水滨宴饮，认为可祓除不祥，后人因引水环曲成渠，流觞取饮，相与为乐，称为曲水 Ancient Customs, in the lunar month on the day had (had in early days after the beginning of the Wei, Jin fixed March 3) feast on the waterfront that can cleanse than ominous, and their descendants into a channel for water ring song, Liuchang take to drin