We have investigated photoionization of ground state of Be-like, B+, ions the photon energy range 25.16 to 31.15 eV. Calculation of cross section for double-excitation auto ionization resonances of beryllium-like B+ ion using the multiconfiguration relativistic random-phase approximation ( MCRRPA ) are performed. Precise energies and widths of all five Rydberg series of doubly-excited states are given in the photon-energy region between second and third ionization and Experimental works and excellent agreement is also shown.