The fresh leaves come from the famous mountains of Ya'an. The picking period is from the first ten days of April to the beginning of May every year. They are steamed to kill the green, rolled for three times, dried for three times, sifted and sorted carefully. Thin, short, straight, black and white, high dryness, even and perfect. The soup has bright green color, rich ripe fragrance, long-lasting millet fragrance, tender green and beautiful leaf bottom, with one bud and one leaf.