為增加國有土地供給，眾所周知，政府將提供國有土地使用權，但事實上，一般人很難取得此一種利，因為國有地使用權已因缺乏土地市場觀念和現行運作失靈的制度而僵化，導致國有地資源被占用和破壞情形嚴重，顯示國有土地供給和有效利用之困境問題。 本文依據國有地特性和“所有權與使用權分離”理論，探尋一個新的財產權－「一元化使用權，以為解決此一問題之法，依此新制，讓使用權人--公部門或私部門於繳納合理費用後，均能於較長期間內使用、收益、抵押、出租和轉讓使用權，達成國有地資源永續利用之目的。 / In order to Increase the national land supply，as we know，the goverflthent will provide national land nith its use right， But， in fact， national land use right is not easy toobtain by the general public，due to the lack of land marketing concept and the failure of system operation， its exertion become so rigid. This Is the reason that national land resources was occupied 1llegally and destroyed seriously in Taiwan．It reveals that the national land supply and its efficient utilization encounter somewhat dilemma. Accoroing to characteristics of national and the theory of detaching ownership from use right. We should search for a new property right“an unified land use right”to soive its problems.Under this new system，the user，either private sector or public sector, after paying a reasonable fee or rent，can obtain the use right of the national land to use, income, to mortgage, to lease, and to transfer in a longer duration, so that the land use in sustainable stat.