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In the present research,investigations of Ng-BeS are performed.With the aim of not only understanding of the structures,energetic stabilities properties of the systems,but also to have an insight into the nature of the interaction between Ng atoms and Be.Investigation of the NgBeS series at MP2 and DFT theoretical level with extended basis sets provide reliable structures and stablilities as well as insight into its nature of interaction and the electron properties.The interaction between Ng-Be is polarized dative bond caused by the deformation of Ng population.NBO analysis shows that the LP(Ng)→BD*(Be-S)donor-acceptor interaction dominate the stability of the systems.