Aiming at the challenges of source-grid-load-storage balance under high renewable penetration and the inadaptability of traditional adjustable-load theories, this paper systematically reviews the research progress of source-grid-load-storage systems for high-density land-based aquaculture under rigid load constraints. The system evolution is analyzed from three dimensions: technical integration, scenario adaptability, and scale expansion. A three-dimensional load rigidity classification system is constructed, and four core contradictions are extracted. Three typical configuration modes and four-level key supporting technologies are summarized. Results show that existing strategies can alleviate source-load imbalance and reliability pressure, but still have deficiencies in dynamic modeling, operational resilience, standardization, and coordinated control. Future directions are also prospected. This review provides theoretical support and technical reference for relevant system planning and optimal configuration.