The square composition of this painting, with a Green Dragon pattern in the middle circle, originated from the tile of the Han Dynasty（202BC-220）, with a large dot in the middle. Green Dragon, White Tiger, Rosefinch and Xuanwu are called the “Four Gods” in Chinese culture, representing the season and orientation. The Green Dragon represents the East and spring. The Four Gods pattern were widely used in the Han Dynasty. They can be seen in bronze mirrors, lacquerware, stone carvings, bricks and tiles and other handicrafts. The red cirrus around the Green Dragon pattern imitates the pattern on the lacquerware of the Han Dynasty.