王充順氣言性，構成用氣成性的理路，而氣的根源則可上溯於天，通過天體施氣，使氣凝聚而成人性。因此王充的人性論可謂承氣化宇宙論而來，故其延續氣化的觀點以言人性，使人性論由先天稟氣厚泊所決定，而分為善、中、惡三等，成為宿定既成的善惡傾向，而此傾向又可經後天教告率勉而移轉，故人性雖由稟氣所定，但非一成不變者。然而，王充以「用氣成性」論說人性，於理論上雖能成立，然其對於一系列相函的命題往往在義理上未能有縝密的照顧。如其論性稟於氣，而其對氣的規定，除了於自然之氣外，又轉而說父母之氣，使宇宙論與人性論無法貫通成一系統；又如其以氣之多寡分人性為三等，是將氣量化以規定性之傾向，所以儘管氣能承天德而為善氣，但是他既從氣的多寡著眼，則擺落了氣能具道德特質的理路，而人性善惡既不由氣的特質而來，氣的道德層面也就與人性無關，而無法成為人性道德傾向的形上根據，故王充從稟氣多寡的強度規定人性，實截斷了天道德性下落於人性的可能。這些理論問題不僅僅反映出體系內部仍有諸多義理尚待填充，更重要的是，致使他在批評以往諸家時缺乏了嚴密的體系作為理論後盾，而這些都是王充人性論的獨特意義之外，所留下種種問題。

Wang Chung used Chi to describe the nature of human, which constituted the reasoning of Chi as the nature of human. The origin of Chi could be traced back to the celestial body; thus, human nature could be cohered through the Chi imposed by celestial body. Therefore, Wang Chung’s theory of human nature is described as a theory derived from Energy-Cosmology, which also describes human nature from the perspective of Chi. Human nature is decided by intrinsic Chi, which could be divided into virtuous, neutral, and wicked tendencies of human nature; however, the tendencies is altered by postnatal teachings, so human nature is not permanently determined by intrinsic Chi. Though Wang Chung’s theory of Chi as human nature is established in theory, it often fails to complement propositions in other relative philosophical connotations. For instance, Cosmology and Theory of Human Nature cannot be connected as a whole because Wang’s theory defines that Chi can be from nature and from parents; the theory describes that the quantity of Chi will determine human nature, which deviates away from the reasoning that Chi possesses qualities of morality. If human nature is not decided by the quality of Chi, then the moral aspect of Chi is not related to human nature. Consequently, Wang Chung cannot define human nature from intrinsic Chi if his theory also says that human nature is determined by the quantity of Chi. These theoretical issues not only reflect the holes of the philosophical connotations in the system that are waiting to be filled but also reveal the fact that Wang Chung’s criticism on various schools lacks strict system as theoretical backing. These are the issues and unique significance from Wang Chung’s Theory of Human Nature.