Abstract: As a core insulation component of gas insulated switchgear (GIS), the service reliability of basin insulators directly affects the safe and stable operation of the power system. Based on the operation and maintenance data of GIS equipment at 330 kV and below voltage levels in a regional power grid in northwest China from 2018 to 2024, this paper systematically reviews the typical defect types and distribution patterns of basin insulators during service, and deeply analyzes the fault causation mechanism under the coupled effects of material defects, manufacturing processes, installation techniques, and operating environments. A multi-dimensional collaborative detection strategy covering online monitoring, intelligent inspection, multi-modal fusion detection, and information management platform is proposed, and a whole-process quality control system is constructed. Practical application shows that the proposed strategy can effectively improve the defect detection rate and reduce the fault outage time, providing theoretical basis and technical reference for lean operation and maintenance of basin insulators.