Double perovskite Pr2NiMnO6 was prepared by solid state reaction.Single phase of Pr2NiMnO6 was concluded by X-ray diffraction.The valence state of Ni/Mn and the ferromagnetic behavior were analyzed by X-ray photoelectron spectroscopy(XPS) and magnetism measurement system，respectively.The results indicated that Ni/Mn are mainly divalent/tetravalent and the strong ferromagnetism of Pr2NiMnO6 obtained by magnetic measurements at low temperature is attributed to predominant Ni2+-O-Mn4+ rather than Ni3+-O-Mn3+ ferromagnetic superexchange interaction.This study provides an important clue for the exploration of the magnetism origin of La2NiMnO6.