A survey was conducted on 19 outdoor stone cultural heritage sites in Shaanxi Province to have a record of the state of bio-deterioration. Including in study were the type and species of the organisms and their distribution patterns. The survey results suggest that bio-deterioration agents included algae, lichen, moss, higher plants and animals. Lichen was found in 16 sampling sites, algae in 11 and moss in 6. During this survey, 16 algae, 16 lichen and 8 moss species were identified and collected.