Colorful pool is the essence of Jiuzhaigou lake, is the smallest and most abundant color of Jiuzhaigou sea seeds, the upper half is blue, the lower half is orange red, the left is sky blue, the right is olive green. The lake is full of aquatic plant communities such as sponges, algae, small alfalfa, and herbs such as reeds, grasses, and water wicks. These aquatic communities contain different chlorophyll depths and can show different colors in the lake water rich in calcium carbonate.