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To obtain various Ni/Mn orderings,we use a low-temperature synthesized method to modulate the Ni/Mn ordering of the ferromagnetic-ferroelastic La2NiMnO6 compound,and the Ni/Mn ordering is estimated by the low-temperature saturation magnetism.The microstructures,crystal structures and magnetic properties are investigated,and the Landau theory are used to describe the form and magnitude of the coupling effects between Ni/Mn ordering and magnetic order parameters.It is predicted that the Ni/Mn ordering would be a strong coupling effect with the Curie transition temperatures if the La2NiMnO6 sample stoichiometry is close.