"Cuckoo Feifei advises early ploughing, pounding and hoeing to take advantage of the spring." The plan of the year lies in the spring. The cuckoo's call wakes up the sleeping spring and the busyness of the year. "Ru Mi Period" is the oldest traditional folk custom of the Nu people living in the Nu River valley, and it is also one of the grandest festivals of the Nu people.

Legend has it that on March 6th every year, a bird would fly to the walnut tree in the village and sing a pleasant song, the tone of which is similar to that of "Ru Miqi". At this time, holding the "Russian Period" will bring good weather and good harvest in the coming year.

On this day, people are smiling, slaughtering pigs, killing chickens, drinking and celebrating: shooting crossbows, playing swings, singing and dancing, it is very lively. The bonfire at night is the home ground for the boys and girls holding "Dabiya". In the love song "Oh Dee", the young men and women sang the deep affection in their hearts.