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The structural, electronic and magnetic properties of pairwise Mn impurities doping in silicon are studied using first principles based on the density functional theory (DFT) in a superceli approach.The pairwise Mn atoms are arranged with different doping types (substitutional or interstitial)and Mn-Mn distances to make of various configurations in order to study the interactions between them.The results show that the energetically most favourable configuration has the smallest magnetic moment.Because of the Mn-Mn interactions, significant changes in the bond lengths, magnetization and electronic properties are observed.It is found that the orbital hybridizations lead to a decrease of magnetization and vanishing of the half-metallic property.Especially, there is an insulating/metallic character depending on the Mn-Mn distance.The strong electron correlation also has an obvious influence on the electronic structure.