Algae well is Chinese ancient architecture in a decorative wooden structure roof, more built in the palace throne above.

Since the ceiling flat top upward concave, like a dome. Graphics are square, round, octagonal, or superimpose these graphics into a more complex spatial composition, with a variety of patterns, carvings and paintings.

According to the "Customs": "Today's hall as a patio. The well, the image of the East Well also. Ling, things in the water. All so aversion to fire also."

According to the structure of the square well and the center pattern can be divided into five categories:

①Square wells stacked algal wells: is the legacy of the Northern Dynasties Pingqi pattern, only to retain the structure of the square wells stacked frames, wells within the pattern but there are a variety of changes.

② Coil stem lotus algal well: a unique algal well in the Sui dynasty, characterized by a well is an eight-petal lotus, lotus coiled around the deformation of the stem trailing Lonicera, pattern tendency of the natural form. Outside the well, there are round Lianzhu pattern, Lonicera, white bead pattern of three side decorations, long, large and exquisite triangular pattern hanging mantle. Sui algal well works without program, image novelty, thousands of sides, each show their thoughts, each has its own wonderful.

3 Flying Lotus Algae Well: the well heart is wider, around the large lotus painting a number of flying around the lotus flying, such Algae Well decorations have transcended the space of the cave room, so that people have a kind of head looking up at the feeling of openness and vastness.

4 double-dragon lotus algal well: the heart of the well on both sides of the lotus painted as two dragons playing beads, algal well around the painting of sixteen flying flowers playing music, inside and outside the echo, there is a strong sense of movement.