White Paper on the BRICS Digital Sovereignty Index is compiled by Institute for Digital Economy & Artificial Systems (IDEAS-BRICS) and other institutions. This white paper systematically assesses the digital sovereignty development status of BRICS and the expanded BRICS+ members based on the Digital Sovereignty Index (DSI) framework. For the 11 assessed countries, the assessment team systematically collected and analyzed objective evidence regarding each country’s policies and regulations, infrastructure deployment, technological capability development, and participation in international rules in the field of digital sovereignty, covering the 4 dimensions and 16 indicators of the DSI framework. This assessment reveals that the digital sovereignty development of BRICS countries and BRICS+ expanded member countries exhibits significant differentiation. This disparity reflects not only the different resource endowments, development stages, and strategic priorities of each country, but also highlights the common challenges faced by Global South countries on the path of digital sovereignty construction.