Official approval for joint Sino-Japanese archaeological excavations at the site was given in 1994. Researchers have now found remains of human habitation including approximately 100 dwellings, burial areas, sheds for animals, orchards, gardens, and agricultural fields. They have also found in the dwellings well-preserved tools such as iron axes and sickles, wooden clubs, pottery urns and jars of preserved crops. The human remains found there have led to speculation on the origins of these peoples.
Archeological findings from the ruins of Niya are housed in the Tokyo National Museum.