三民主義形上學，是奠立在心物合一論及天人合一論的基礎上。心物合一與天人合一的思想，貫穿三民主義對宇宙、人生和歷史的看法。

心物合一論主張宇宙的根源是精神與物質的統一體，同時是陽性與陰性的調和體。宇宙存在與發展的法則，是調和的授受法。心物合一的本體，就是西洋宗教上的創造主、神，或中國哲學中的上帝或天，是人格神。

天人合一論主張人性根源於神性，故本性人是相似於神的完全人，而本然的人生是真善美的人生及富足的人生，人類本來不必過貧窮、疾病與戰爭的生活。

本研究引用文鮮明牧師對於神、惡主體、惡的發生及通過善惡鬥爭以復歸善的形上理論，對說明人類歷史為何會往實現神性及大同世界的方向發展之理由，有重大俾益，因此對建構三民主義的形上基礎理論，有直接的幫助。

The metaphysics theory of Dr. Sun Yat-Sen's doctrine is based on the Theory of Unification of Spirit and Matter, as well as the Theory of Unification of Heaven and Man. The thought on both theories penetrate the view of Dr. Sun Yat-Sen's doctrine on cosmos, life and history of mankind.

In the Theory of Unification of Spirit and Matter, the origin of the cosmos begins from the union of the spirit and matter, and the harmonious relationship between its positivity and negativity. The law of existence and development of the cosmos is based on the harmonious action of the Law of Give-and-Receive. The ontological reality of the Theory of Unification of Spirit and Matter is basically the God or the Creator in western religion, also the God or Heaven in the Chinese philosophy, which is the God of personality.

The Theory of Unification of Heaven and Man emphasizes that the human original nature comes directly from God. Originally, the character of a perfect individual resembles God's perfect nature. Thus, the life of original human being is a reflection of truth, goodness and beauty, as well as being wealthy; there should be no poverties, sicknesses and wars in the original world.

In my thesis, I will introduce Reverend Sun Myung Moon's metaphysics theory on God, the origin and the cause of Evil, and the Restoration of Goodness through the struggle between good and evil. His thought will helps tremendously for us to illustrate the reason behind the development of human history aiming for the realization of God's nature and the ideal world on earth. Indeed, Rev. Moon's metaphysical views can be an effective tool for the construction of Dr. Sun Yat-Sen's doctrine on the fundamental metaphysics theory.