数据成为新兴生产要素，跨境数据流动愈加频繁，网络空间拓展成为“第五疆域”，传统主权概念延伸至网络空间，“数据主权”应运而生。跨境数据流动成为我国数据主权治理核心。文章立足数据主权保障视角，充分调研国内外跨境数据治理制度体系与实践，基于管辖原则剖析其核心治理模式与冲突所在，总结区域内效果管辖、全球化扩张管辖、集中本地化管辖三种跨境数据治理模式与其中存在的立法、司法、执行与治理冲突。基于此，文章结合我国现状，提出优化资源安全保障、促进数据资源流动、加强域外规制、推进治理规范化、融入国际治理体系、参与治理对话、参与国际合作等可落于实处的对策与建议，以从国内外双向优化跨境数据治理，为我国数据治理实践提供借鉴，保障我国数据主权。

As data becomes an emerging production factor, cross-border data flows are more frequent, cyberspace expands into the "fifth frontier", and the traditional concept of sovereignty extends to cyber space, data sovereignty emerges. Cross-border data flow has become the core of data sovereignty governance in China. This paper, from the perspective of data sovereignty protection, fully investigates the system and practice of cross-border data governance at home and abroad, analyzes the core governance models and conflicts based on jurisdictional principles, and summarizes the three cross-border data governance models, namely, intra-regional effect jurisdiction, global expansion jurisdiction, and centralized localization jurisdiction, as well as the legislative, judicial, enforcement and governance conflicts that exist among them. Thus, practical countermeasures and suggestions, in an attempt to provide references for China's data governance practice and safeguard China's data sovereignty, are proposed to optimize resource security, promote data resource flow, strengthen extraterritorial regulation, promote governance standardization, integrate into the international governance system, participate in governance dialogues, and engage in international cooperation, in order to optimize cross-border data governance in both directions, national and international.