In January 2008,during archaeological excavation of a late Neolithic remains site by Chengdu Institute of Cultural Heritage and Archaeology and Xindu Heritage Cultural Relics Administration,two earthen pit graves were unearthed.A complete set of human bone remains was found in grave M1,which has high research value.Due to its great age and the severe environment, the bones easily disintegrated into powders,which made direct extraction impossible.To protect and preserve the precious Neolithic human remains for future study,the “case” method was applied to extract the entire pit grave. After several experiments,adhesive agent A305 was used to repair cracks;protective agent GSA and B365 were used to reinforce the pit.Extraction and protection of the pit were observed to be satisfactory.A scientific protection program has been proposed. The successful extraction and protection of this pit provides a reference for heritage conservation in humid areas.