In response to the core proposition of scientific regulation and quantitative analysis of spatial equilibrium of water resources, this article analyzes the connotation and basic characteristics of spatial equilibrium of water resources from a multidimensional perspective of historical evolution, practical needs, and system coupling. It deconstructs the complex system of water resources-economic society-ecological environment and constructs a theoretical framework for the regulation of spatial equilibrium of water resources. From the trinity perspective of ecological security, social equity, and economic development, it explores the multiple mechanisms of water resources in safeguarding, coordinating, and linking the ecological environment and socio-economic systems. By integrating dynamic symmetry thinking with statistical principles and algebraic geometry ideas, a dynamic equilibrium statistical model for water resource allocation in both time and space dimensions is developed to quantify the dynamic adaptation rules between systems and identify key driving factors. The research results can provide a quantitative decision-making tool for collaborative optimization of water allocation, ecological protection, and socio-economic needs, offering a systematic solution that combines theoretical depth with practical operability to address the spatial mismatch of water resources in China.