A problematic appeared in Jin Yuelin’s金岳霖 (1895–1984) philosophy in the wake of the new texts published at the end of the twentieth century, that is, he began to consider the relationship between humanity and nature or the “boundary of nature and humanity” from the macro perspective of East-West philosophy and civilization. But, as we all know, this is an area of research that is quite lacking. No matter if it is how important this question was for Jin Yuelin’s philosophical thought itself or if it is the importance of this question for contemporary humanity, there is a need for us to take such research further. This chapter investigates the question of the appearance of evolution in the philosophical thought of Jin Yuelin: why did he begin to focus on this question in the 1940s? Beginning from here, the author combines existing textual records with newly published ones to situate this problem within the framework of Jin Yuelin’s metaphysics with the goal of showing how this problem therein developed: how did Jin Yuelin understand the relationship between humanity and nature from this new perspective? Jin Yuelin proposed a reconstruction of the rational method of “treating nature well” (shandai ziran善待自然) that is the regulation of humanity’s “mind” and “naturality” (ziranxing自然性) as well as the belief in a “philosophy of a sagely life” (shengren renshengguan聖人人生觀) that is centered on the concept of the “unity of humanity and nature” (tianren heyi天人合一). In this way, Jin Yuelin marks a stark contrast with his contemporary times that laid emphasis on curing the unhealthy relationship between humanity and nature through the means of technology. And even though he “idealized” this point, it is still certainly quite important.