In this work, we have realized some spectroscopic calculations in the framework of the nuclear shell model, in order to estimate the Gamow-teller (GT) β +decay of A=98 proton rich isobars in 100Sn mass region near rp-process path. The calculations are carried out by means of Oxbash nuclear structure code, taking into account the monopole effect in the studied mass region. The obtained results are then compared to the available experimental data.