A scientific data center is a vehicle for scientific data management, and assessment and certification are very important for the scientific data management of scientific data centers. The Data Seal of Approval (DSA) established mechanisms to enable trusted digital repositories to provide core level certification for data repositories. Subsequently, the World Data System (WDS) of the International Science Council and DSA jointly launched the CoreTrustSeal partnership certification and international scientific data center certification worldwide. With the Measures for Managing Scientific Data released in March 2018 by the State Council of China, China's scientific data centers are facing the urgent need to improve their level of professionalism and international influence. Hence, this paper analyzes the three categories of articles and 16 requirements for CoreTrustSeal certification, introduced in the actual certification document of the World Data Center for Renewable Resources and Environment (WDC-RRE), which was established in 1988. It also details the experiences of certification and suggests that a scientific data center should strengthen its top-level design, pay attention to long-term data cataloging, improve the level of internationalization, strengthen the preparation of certification supporting materials, and advance the online accessibility of certification materials. After submitting its application in April 2018, the WDC-RRE became the first CoreTrustSeal-certified Trustworthy Data Repository in the geosciences field in Asia in February 2019.