The ancient horse bone in Zhaoyang tomb in the Late Spring and Autumn Period has been embedded for over 2500 years and has suffered from serious deterioration.The horse bone was cut into sections and was broken during several transportations.The surface of the bone was efflorescent due to disposal open to the air for long.In order to treat the breakage and efflorescence of ancient horse bone and support it properly,the following methods were adopted.The structure of the horse bone was observed by SEM;the mechanical properties were examined;the supporting soil underneath the horse bone was changed and lightened;the water vapour from the floor was prevented;the bone was reconstructed;and finally the bone was protected from weathering.The conservation of ancient horse bone in Zhaoyang tomb in the Late Spring and Autumn Period was successfully achieved in May,2008.