所謂「行政保留」，應指憲法賦予行政權的自主空間。本文以權力分立的理論為基礎，比較法國、德國與美國的憲法架構中，行政與立法兩權之關係後，再分析我國憲法之權力分立結構，導出我國憲法可能承認的行政保留領域。 作者以為，是否承認「行政保留」理論，端視各國憲法對於行政與立法關係如何劃分。行政權擁有越大的獨立性或自主性，行政保留的空間就越大。 本文主張，我國憲法既非典型內閣制，行政與立法權具有分立、平行甚至對抗之色彩。因此行政保留理論應為我國憲法所承認。至少在高階官員任免權、行政機關組織權、預算權、對外事務處理權，以及法律之執行權方面，應承認行政保留之存在，而能排拒立法院之侵害。

The so-called "Executive Reservation" (VerwaItungsvorbehalt) should be the Executive's autonomy conferred by the Constitution. The article bases upon the doctrine of Separation-of-Powers, compares the Executive­Legislative relationships in France, German, and the United States constitutional structures. Then the author analyses the Separation-of-Powers structure of the R.O.C. Constitution, concludes that certain spheres should be recognized as the Executive Reservation. The author claims whether the Executive Reservation can be recognized depends upon how the Constitution allocates the Legislative and Executive Powers. The more the Executive branch is independent and autonomous, the more the scope of Executive Reservation exists This article argues that since the R.O.C. Constitution is not the typical Parliamentary System, the Executive and Legislative branches are rather separate, equal, and even counter. So the Executive Reservation should be recognized by the Constitution. There are at least in the areas such as the authority to appoint and dismiss high rank officers, the authority of agency organization, the power to deal with foreign affairs, and the execution of laws, the Executive branch has the constitutional autonomy which can resist the Legislature's invasion.