Quantum chemical calculations on the low-lying electronic states of PS correlating with the lowest four dissociation limits are performed by utilizing the internally contracted multireference configuration interaction method (icMRCI) with all-electron Gaussian basis sets. The potential energy curves (PECs) and spectroscopic constants of low-lying bound states are computed. It is of interest to compare the spectroscopic constants of low-lying bound states for the PS molecule with experimental and theoretical results. The detailed information on the properties of the emission 22Π1/2-X12Π1/2, 22Π3/2-X22Π3/2, 12Σ−1/2-X12Π3/2 and 12Σ−1/2-X12Π1/2 bands of PS system, including the transition dipole moments (TDMs), permanent dipole moments (PDMs), Franck-Condon factors (FCFs) and radiative lifetimes, has been identified. We first calculated the f value and radiative lifetime of this radical. Whether the C state is 12Σ− or 12Δ is discussed. According to the calculation results, it is confirmed that the experimental C state is redistributed to 12Δ. Our study should be valuable for further experimental works understanding the spectroscopy and dynamics of the electronic excited states for PS.