Steady-state spatial soliton pairs resulted from the combination of pyroelectric and photovoltaic effect were predicted for unbiased photovoltaic photorefractive crystals. The numerical solutions of pyroelectric photovoltaic soliton pairs were deduced theoretically based on the incoherent coupling wave equations. The intensity envelopes of soliton pairs were obtained by finite difference method. The results show that the bright-bright soliton pair can be established in self-defocusing photovoltaic crystals when the positive pyroelectric field is large enough compared with photovoltaic field. For the dark-dark and grey-grey soliton pairs, the negative pyroelectric field can enhance the self-defocusing nonlinear effect and reduce the full width at half maximum of soliton pairs. The full width at half maximum of soliton pairs can be controlled by adjusting the value of the pyroelectric field. Moreover, the pyroelectric photovoltaic soliton pairs can degenerate into pyroelectric soliton pairs or photovoltaic soliton pairs under a certain conditions. The characteristics of photorefractive crystal LiNbO3 can transfer from self-defocusing to self-focusing by virtue of the pyroelectric effects, which can help to control the characteristics of soliton pairs.