The far-field unidirectional scattering properties of silicon nanocross dimers are investigated systematically by the finite element method. The multipole decomposition method is used to explain the scattering properties of nanocross dimers. By the analysis of the effects of different resonance modes on the scattering properties of nanoantennas, it is found that the coupling of these resonance modes of silicon nanocross dimers leads to the formation of magnetic hotspots and the far-field unidirectional scattering. The adjustable optical properties of nanocross dimers may provide a solid theoretical foundation for achieving far-field unidirectional controllable nanoantennas.