The conservation of the historical sites is one of the most complicated issues of cultural heritage conservation; and earthen cultural heritage is the most difficult; so the conservation of the historical earthen sites has been listed as the special conservation item. As for the historical earthen sites in moisture circumstances

the task of the conservation and exhibit is more urgent. The Liangzhu Culture of Neolithic period is the most important prehistory culture in the Yangtze River valley and Tangshan Site is located northwest of the Liangzhu Sites. Four protective materials are chosen to implement on Tangshan Site in situ

i.e. PS

WD-10

WD-S

and RTV. The results of experiments in lab and in situ (after 2 months

6 months

and 9 months) indicated that the waterproof character of RTV and WD-10 are better than WD-S

and WD-10 and WD-S could only be used as waterproof materials

PS could only be used as consolidant but RTV was of favorable waterproof and consolidation effect.