Abstract: A study on batch extraction, high-temperature batch extraction and multi-stage counterflow extraction for pig bonewas discussed in this paper. The result showed that the multi-stage counterflow extraction was better than others in theconcentration of soluble solid and the yield of extracts . F.E.A (Facter of Extract-ing Ability ) of batch extraction was thehighest. But by improving the process of the multi-stage counterflow extraction, its F.E.A became the best in these threeextractions. So the multi-stage counterflow extraction could be utilized for extracting deboned bones.

Key words: Bone extract , Extraction