The preparation for constitutional system progressed steadily as the reform of Imperial Japanese Army toward German-style system, education reform such as Imperial University Law and Primary School Order and establishment of local authority system were carried out, and Ito himself made the draft of the Constitution of the Empire of Japan along with Kowashi INOUE, Kentaro KANEKO, and Miyoji ITO.
大日本帝国陸軍のドイツ式組織への改革や帝国大学令・小学校令などの制定に代表される教育改革、市町村制の確立などが行われ、伊藤自身も井上毅・金子堅太郎・伊東巳代治と大日本帝国憲法草案を作成するなど、立憲体制への準備が着々と進められた。