The mismatch in Young's Modulus between a bone and an implant tends to cause the problem of stress shielding. This phenomenon leads to resorption or loss of implant. Porous ceramics are more resistant to compressive stresses than porous polymer and more resistant to corrosion than porous metals. Due to the presence of pores, porous ceramics can have similar Young's Modulus to bones. Another advantage of porous ceramics is the ability to allow bone to ingrown in the pores. This is especially true for hydroxyapatite-Ca10(PO4)6(OH)2 (HA). HA is the main inorganic component of natural bone. Synthetic HA ceramics are bioactive and biocompatible materials due to the similarity of composition and crystal structure to natural HA. Thus, with porous ceramics, it is possible to simultaneously achieve bone ingrowths for mechanical interlocking and direct bone bonding for additional interfacial strength. It is very important to obtain porous ceramics that have gradient or graded pore size and/or porosity or the both. The highly interconnected and functionally graded porous ceramics has many advantages, for example, the graded porous design allows smooth load transfer and minimizes stress shielding problem. From the set of methods the sol-gel technology has many advantages: simpler forming of coatings at rather low temperatures, possibility to adjust oneself to microstructures of bone, feasibility to synthesize coatings with complex composition. The present paper is devoted to the research of hydrolyzed alkoxide solutions for development of modified HA based ceramics with tailored pore structure. Data of particle sizes of HA powders used for composition together with the chemistry of sol-gel process, the pore structure of composite ceramics, and structural investigations were discussed.