There are many factors influencing the interactions between nonlocal spatial solitons.It is showed that the interactions of two spatial solitons in nematic liquid crystals are dependent on phase and bias voltage by numerical simulation and experimental tests.Based on the nonlocal nonlinear Schro?dinger equation (NNLSE),numerical calculation is carried out by Fourier transform method.And then the influence of phase difference on interactions between nonlocal spatial solitons is analyzed in detail.By experimentally investigating the interaction properties of two solitons in nematic liquid crystals in different incident conditions,the relationship between the position of crosspoint and the bias voltage are got.