Аннотация:A number of materials based on biocompatible polymers (polyvinylpyrrolidone and sodium alginate) with hydroxyapatite and dicalcium phosphate dihydrate were developed. The properties of prepared materials were studied by IR and EPR spectroscopies depending on the composition and method of synthesis of calcium phosphates. The introduction of calcium phosphates into the polymer matrix was found to decrease the material porosity from 60—70 to 40—45 vol.% and to decrease the material swelling from 250 to 150%. The results of EPR spectroscopy showed that polyvinylpyrrolidone does not affect the calcium phosphates formation in the synthesis of calcium phosphates in situ. In vitro studies suggest that a composition containing polyvinylpyrrolidone and sodium alginate in a ratio of 1:1 obtained ex situ is preferable in connection with its good biocompatibility and an absence of cytotoxicity. This material is promising for the application in medicine.