In terms of shape and design, materials and materials, the Gaya group is a structure made of soil, stone, and wood. The tree is corroded and disappeared, but the structure using soil and stone is well preserved. In particular, scientific excavation surveys have confirmed the method of establishing the main body of the store, the method of burial, and the method of building the burials. The maintenance of the tombs is based on the results of excavations and scientific analysis on the amount of work required for the construction of the origin of the stone and the ash used in the construction of the tombs and the construction of the tombs.
In terms of location and surrounding environment, the tombs are archaeological heritage, which has not been relocated since it was originally constructed, and maintains its structure well and has high authenticity. Some of the hills where the tombs are located have been severed or damaged by urban planning such as later railways or roads, but the city government, which controls the remains, is making efforts to restore the authenticity of the remains. In spite of urbanization in the surrounding area, application heritage is not directly influenced by buried cultural property, so it maintains its authenticity to the present.
In terms of mental and emotional aspects, the tombs were found in a place where they could easily be seen from the residents' bases, and they were recognized as sacred spaces with ancestral tombs for local residents. For this reason, other facilities except the tomb were not formed in the upper part of the hill where the tombs were located, and they were able to maintain their original form without being greatly damaged. The creation of the civilizations around these tombs can be regarded as the desire of the local people who want to create the tombs of the ancestors in the sacred space.