Wooden artifacts deteriorate when they are buried for a long time because of the humidity and microbial attacks. After excavation they easily shrink or deform since inner water soon evaporates if they are left as they are. To keep the shape of deteriorated wooden objects the inner water of wood is exchanged by chemical agents. The main methods applied here are as follows: the PEG (Poly Ethylene Glycol) method, the sugar alcohol impregnation method, and the freeze-drying method, the alcohol-xylene-resin method and in addition fatty acid ester techniques as an original method. In order to treat successfully we select the most suitable technique observing the extent of degradation, angle of the artifacts and also species of wood.