Abstract: Λ hypernuclear spectroscopy is a major tool for investigating the Λ-N interaction, exploring the inner structure of nuclei and finding the possible changes in the property of the Λ particle embedded in nuclear media. Important results have been achieved by means of the electro-magnetic spectrometer and γ-ray spectrometer. Some features of the energy levels of hypernuclei such as the core excitation, the excitation of the Λ particle in a p-shell, the genuine state which can only be found in hypernuclei, etc. have been revealed; the spin dependent shell model parameters of p-shell hypernuclei have been determined experimentally; the shrinkage of ⁷_ΛLi caused by the glue-like effect for a Λ sitting in the 0_s orbit has been discovered. However some discrepancies between experimental results and theoretical calculations need to be further investigated.