Intensive scientific investigations have been devoted to phosphates. These investigations have concerned the synthesis, the structural features or the physical properties (electrical, magnetic, optic, electrochemical….). As layered materials are attractive for the electrochemical applications, we have prepared and studied Na2CoP2O7 which could be used as starting material for Li2CoP2O7 preparation by Na/Li exchange reaction. Na2CoP2O7 was prepared by coprecipitation method and the structure was refined by using the Rietveld method. Na2CoP2O7 exhibits a layered structure (S.G. P42/mnm; a.= 7.704 (3) Ǻ, c = 10.293 (5) Ǻ). Within de CoP2O7 sheets, each CoO4 tetrahedron shares corners with P2O7 rings. Sodium ions are located in a very large crystallographic site. The prepared phosphate has been characterized by IR spectroscopy which confirms the structural results.