The four Qijia culture house foundations in the Lajia site were excavated in 2000 and 2001.In the following years,unfortunately,the remains were seriously deteriorated due to many physical and biochemical factors;the house remains and the human skeletons inside were damaged to various degrees.All these environmental factors resulted in the changes of their original physical conditions.A package of measures for in[JX-*6]situ conservation and consolidation of these features and finds was made and according to the site condition and other visual documents.After this programme was approved by the authorities,the work of the physical conservation and chemical consolidation was undertook,and it became possible to exhibit this significant natural disaster site to the public.