To date, the philosophical status of Chu Hsi has not been clear. This study attempts to investigate the Neo-Confucian status from the perspective of Chu Hsi's "to study the phenomena of nature." The meanings of Chu Hsi's "to study the phenomena of nature" are diversified. This study analyzed and summarized Chu Hsi's relevant discourses from the perspective of bibliography, and found that "to study" mainly has two meanings: one meaning is "to explore," and the other meaning is "to perceive." "Phenomena of nature" has six meanings: "phenomena of existence," "neutral phenomena," "moral phenomena," "neutral and moral phenomena," "phenomena of virtue," and "internal and external phenomena." To study the "moral phenomena" and "neutral phenomena" is Chu Hsi's focus of "to study the phenomena of nature". To study the "phenomena of virtue" and "internal and external phenomena" conforms to orthodox Confucianism in China. However, such cases are fewer in Chu Hsi's Neo-Confucian ideas, and they did not win the recognition of Chu Hsi. Therefore, in terms of "to study the phenomena of nature," the main Neo-Confucian idea of Chu Hsi fails to conform to orthodox Confucianism. However, there are still a few parts which seem to conform to traditional Confucianism.