Analytical potential energy functions and spectroscopic properties for the ground and low-lying excited states of KRb

► The PECs and APEFs of the X1Σ+ and 13Σ+ and 13П of KRb molecule are obtained. ► The spectroscopic parameters De, Re, Be, ωe, ωexe, ωeye, etc. are determined. ► The obtained vibrational energy levels correspond with the experimental data.