The relapsed tremendous mineralization beside meningioma is a rare case. An analysis of its mineral composition may provide some support information for finding the reason of relapse. Using X-ray phase analysis, infrared spectrometry, environmental scanning electron microscopy and high_resolution transmission electron microscopy, the authors observed and analyzed the mineral composition of the samples. The results show that the particle size of the mineral is about 4.3 nm（statistical value, and the main component is carbon hydroxyapatite.It is supposed that there may also be a small amount of amorphous calcium phosphate.