Naka no Oe no Oji contributed his energy to improvement of domestic systems centered around protection of the country by building Mizuki (water fortresses) at various places such as Chikuzen, Tsushima Island, etc., placing Sakimori (soldiers deployed in Kyushu) and beacons, transferring the capital to Otsunomiya Palace and, on the other hand, getting reconciled with Gozoku by restoring Kakibe (privately owned people).
中大兄皇子は筑前や対馬島など各地に水城を築き、防人や烽を設置し、大津宮に遷都する一方、部曲を復活させて豪族との融和を図るなど国土防衛を中心とした国内制度の整備に力を注ぐことになる。