Materials/data for the paper: **Jin, H., Wang, Q., Yang, Y., Zhang, H., Gao, M., Jin, S., … Chuan-Peng, H. (2022, July 15). Chinese Open Science Network (COSN): Building an Open Science community from scratch. https://doi.org/10.1177/25152459221144986 Noted: Thismanuscript has been accepted in ***Advances in Methods and Practices in Psychological Science*** (26 Oct 2022) **Abstract:** Open Science is becoming a mainstream scientific ideology in psychology and related fields. However, researchers, especially early career researchers (ECRs) in developing countries, are facing significant hurdles in engaging in Open Science and moving it forward. In China, various societal and cultural factors discourage ECRs from participating in Open Science, such as the lack of dedicated communication channels and the norm of modesty. To make the voice of Open Science heard by Chinese-speaking ECRs and scholars at large, the Chinese Open Science Network (COSN) was initiated in 2016. With its core values being grassroots-oriented, diversity, and inclusivity, COSN has grown from a small Open Science interest group to a recognized network both in the Chinese-speaking research community and the international Open Science community. So far, COSN has organized three in-person workshops, 12 tutorials, 48 talks, 55 journal club sessions, and translated 15 Open Science-related articles and blogs from English to Chinese. Currently, the main social media account of COSN, i.e., the official WeChat account, has more than 23,000 subscribers, and more than 1,000 researchers/students actively participate in the discussions on Open Science. In this article, we share our experience in building such a network to encourage ECRs in developing countries to start their own Open Science initiatives and engage in the global Open Science movement. We foresee great collaborative efforts of COSN together with all other local and international networks to further accelerate the Open Science movement.