Abstract:A comprehensive technical decision-making method combining investigation and comparative analysis can be adopted to summarize and propose a maintenance engineering scheme for road subgrade voids. Mainly through road related information research and current situation investigation, the corresponding detection content and methods are proposed to conduct on-site inspections. Based on the detection results, the research is carried out on the repair scheme of road subgrade voids. The technical, economic, social and environmental aspects are compared and analyzed from the aspects of construction technology, construction period, traffic impact, engineering investment, carbon emissions, etc., and the final technical scheme is proposed.