The murals of ancient tombs are all hidden in the Donggou ancient tomb in Ji 'an. They are exquisite murals painted on the earth wall of the tomb after the earth tomb replaced the stone tomb. They are valuable materials for studying Koguryo's history and culture from the 5th century to the 6th century.

The tomb murals in the late 4th century, that is, the early tombs, mainly depict social customs and habits. The more famous murals include the corner tomb painting reflecting the scene of Lux's arrival and the dance tomb painting with huge dance pictures. Most of the tomb paintings in this period were created on lime-daubed earth walls, and the overall picture was clear and beautiful, with rich contents, such as feasting, hunting, entertainment, war and many other scenes, in addition to rare birds and animals, flowers, astrology, immortals and other pictures.

From the 5th century to the 6th century, the content of murals has evolved into ghosts and gods, the most representative of which is Tomb No.5 of the Five Helmets Tomb. This tomb is an underground tomb, which consists of three parts: the pyramid-shaped mound, the tunnel and the tomb. The tomb is 4.37 meters long, 3.56 meters wide and 3.94 meters high. The walls are joined with white ash, and the top is a whole flat boulder. The whole tomb is dominated by murals, and there are four gods painted around the tomb. Painting Qinglong on the east wall; The western wall is painted with white tigers; The south wall is painted with suzaku; The north wall is painted with basalt, and the base of the whole picture is the stable pattern of lotus flame net. In addition, the four corners of the tomb are also painted with dragon top beams with animal faces. The Liang Fang, the bottom of the corner stone and the caisson are all painted with pictures of dragons and tigers fighting each other, and there are 39 dragons in the whole picture. It is a miracle that the tomb is humid and transpiration all the year round, but the murals have been as good as new for thousands of years.