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The adsorption effects of 3dtransitional metal (TM) adatoms on electronic and magnetic properties of monolayer and bilayer MoS2sheets have been investigated by using first-principle calculations based on the density functional theory. The calculated results suggest that both monolayer and bilayer MoS2sheets have power abilities of absorbing 3dTM atoms. The interlayer adsorption of bilayer MoS2is relatively more stable than the surface adsorption of monolayer MoS2. The 3dTM adatoms and the neighboring S atoms behave a clear covalent-binding character. It was found that TM adatoms induce certain impurity states within the band gap of the pristine MoS2sheet which result in the systems magnetically semiconducting or half metallic. The adsorbed systems for Cr and Co on the surface of monolayer MoS2sheet, as well as Sc, Cr and Fe in the interlayer of bilayer MoS2sheet exhibit half-metallic behavior. And the other 3dTM-adsorbed systems are magnetic semiconductor except for Ni species.