In terms of the current research in the academic circles of South Korea，many scholars take the concept of “Shi Xin Shi Xue” as a clue to explore the characteristics of “genuine talent” in the tradition of Yang-ming school in South Korea and its influence on the ideological trend of real learning in the later period of North Korea. In this way，we can construct various forms of “genuine talent” in the Confucian tradition，including the tradition and context of Zhu-zi study，Yang-ming study，textual criticism and application study. Based on this understanding，the author tries to discuss the connotation and significance of the genuine talent in the thoughts of Cheng Brothers，and discusses it from four aspects，namely，the relationship between practical science and real learning，practical application，self-cultivation，and the use of flexible ways. In particular，Cheng Yichuan attached great importance to the function or practice of “changing at any time” of Confucianism，and understood the ability of “writing at any time” and “administration in time” of saints by “adaptability”. The combination of “real learning” and “adaptability” is an important trait of Cheng Brothers' “ genuine talent”.