In recent decades, strong correlation materials have been extensively studied due to their interesting physical properties and their breadth and variety, Among them, materials are filled with half orbitals d or f Most studied in theoretical, empirical and computational fields. In addition to Another important research on these materials is that due to the complex properties of these systems, they have been described as a challenge in various fields. The most important categories of these systems are matte insulators. In this category of materials, intermediate elemental oxides such as manganese oxide have attracted much attention due to its properties. Typically, to describe the electron behavior of these systems in the density function theory of the LDA+U approach and FLAPW basic function will be used. In this study, the structural properties of manganese oxide have been investigated first, Then, to study the magnetic properties of the mentioned material to find the amount of exchange interaction between the first to fourth neighbors with the help of the Hamiltonian Heisenberg method Difference in the energy of different configurations and in parallel calculations. Then, using non-homogeneous calculations, we calculated the two-particle coefficients in the Hamiltonian Heisenberg. Finally, with the aid of this quantitative calculation, the mean field method is calculated to measure the temperature of the Neel.