Abstract: The SIC-Xα method is used to obtain the magnetic dipole hyperfine structure constant A of 3p2P3/2 state in Na atom. The results agree well with the experiments. For the research of electric hyperfine structure, we calculated the electric field gradient q, and deduced the nuclear electric quadrupole moment Q according to the experimental value of the electric hyperfine coupling constant B. Thus, the structure of Na nucleus is calculated. This is an attempt to reveal the nucleus structure by the method of atomic physics.