Biphasic calcium phosphate (BCP) bioceramics containing hydroxyapatite and β-Tricalcium Phosphate phases is one of bone grafting biomaterials that quite often used in bone regeneration due to its best characteristics in biodegradability and stability. Nevertheless, those properties are less enhance the bone ingrowth because of the dense and compact structure. Therefore, one of promising way to improve those properties is fabricating the bioceramics in the form of porous scaffolds. In this research BCP/alginate composite scaffolds were synthesized by using calcined chicken’s eggshells as the calcium donor. The synthesis of BCP/alginate scaffolds was performed by adding Na-alginate into BCP bioceramics as a matrix and porosifier with various percentage wt% of 20%, 30% and 40% using freeze drying processes. X-ray diffraction (XRD) results showed that the addition of alginate tends to decrease the crystallinity of BCP/alginate composites. This XRD result, shown by peaks in 2θ range of 10^o-20^o, is in accordance with fourier transform infrared spectra showing the characteristics of functional groups of BCP and alginate. Moreover, the obtained mean pore size of samples are in the range of trabecular bone pore size which is about 200-400 μm with highest porosity more than 65% presented by μ-CT scanning analysis. These results indicate that the corresponding composites may suit as ideal bone grafting materials.