The biological properties of using two kinds of cells, MC3t3-E1 of an osteoblastic cell line and the rat bone-marrow cell (RBMC) as mesenchymal stem cell model were discussed. The HAp fiber was synthesized via a homogeneous precipitation method using urea. The HAp fiber was mixed with the spherical carbon beads having a diameter of ∼ 150 μm in the mixed solvent. The single HAp phase was present in the S0, S1000, and S2000 scaffolds with porosity of 95% over. The results show that the high porosity and large pore size fulfilled by S2000 could provide an excellent environment for enhancing bone marrow cell activity.