The sixth day of the sixth lunar month is the washing and drying festival. Legend has it that a long time ago, on the sixth day of the sixth lunar month, the Dragon King of the East China Sea came out to bask in scales and was discovered by mortals. People wash clothes in the river on this day for good luck, so this day is also called "Laundry Festival".

Han people have the custom of sunning red and green on June 6th. According to legend, the custom of "basking in red and green on June 6th" originated in the Tang Dynasty. Xuanzang, a monk in the Tang Dynasty, returned to China from the Western Heaven. When crossing the sea, the scriptures were soaked in seawater, and they were taken out and dried on the sixth day of June, which became an auspicious day. At first, the emperor wore a dragon robe in the palace, and later it spread from the palace to the Han nationality. On this day, every household basks in the sun in front of the door, which became a custom later. This is the origin of the washing and drying festival.