Abstract: People prefer daylily flowers with brighter and more saturated colours. Among the eight colour groups surveyed, pink, orange and cream were the first three most popular colours. Among the measured colours of daylily, the brightest colours were in the orange and yellow-orange groups, and the least bright colours were in the purple group. The highest colour saturation was in the orange group and the lowest colour saturation was in the grey-violet group. The pathway of anthocyanin metabolism in daylily flower were more smooth, and it was not easy to form light-coloured flowers with less pigment content. The carotenoids measured in daylily flowers were all located in the downstream of lycopene metabolism, and it was difficult for carotenoids to dominate the formation of red and pink colours of daylily flowers. The selection of daylily varieties with highest brightness, light colour as the parents can broaden the range of flower colour in the offspring group, and accelerate the cultivation of daylily varieties that meet the aesthetic preferences of the public.rieties that meet the aesthetic preferences of the public.