In order to obtain the interaction between of the incoherently coupled screening-photovoltaic spatial solitons, taking the two mutually incoherent optical beams with the same polarization and same wavelength as the input wave, the beam propagation equation is solved mumerically. The result shows that attraction and twine of the two solitons from each other occur when the solitons distance is suitable. If the distance is too lager or too small, the two solitons are no interaction. They are deftect simultaneously to the same side with diffusion field