The low-lying excited states of the SiN cluster are studied using the time-dependent (TD) density functional theory (DFT). The calculated results compared well with the available theoretical ones and are used to assign the features of this cluster in photoelectron spectrum. The results indicate that the ground state of negative SiN is 1Σ, and the X and the A signals in photoelectron spectroscopy correspond to 1Σ→2Σ and 1Σ→2Π, respectively. It shows that TDDFT, by and large, can be used to get good results for the excited states of the SiN cluster.