Input data is considered an essential element in the development of AI. Big data is crucial for an AI system to operate smoothly and efficiently. Big data plays a vital role for business entities due to its informational advantages. Therefore, the protection of Big Data is a legal issue that needs to be ensured. The article analyzes the roles of Big Data. Besides, from the perspective of intellectual property, the article affirms that big data can be protected in the form of (i) copyright and (ii) business secret (subject to industry rights). The article points out the international and national legal basis for protecting big data from the perspective of copyright and business secret. The article also points out the difficulties in protecting big data from the perspective of copyright and trade secrets. From there, the article recommends setting up a separate adjustment mechanism for big data to match its characteristics.