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The effects of twin boundary spacing and angle between loading axis and twin boundary on the mechanical behavior of nano-twinned Fe under the uniaxial tensile load were studied by molecular dynamic simulation. The results indicate that the yield stress of nano-twinned Fe increases with the increase of twin boundary spacing, showing a trend of inverse Hall-Petch relation. The deformation twin exhibits in the single crystal iron,which is predominant in the plastic deformation process. The elastic modulus of nano-twinned Fe increases slightly with the increase of twin boundary spacing. When the tensile load is not perpendicular to the twin boundary, the yield stress decreases and the deformation is mainly detwinning.