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The spinodal decomposition ranges of low N-content BxGa1-xNy (P,As)1-y/Ga(P,As) alloys grown on Ga(P,As) (001) substrates, are described. The alloys are represented as strictly regular solutions. In the analysis, we take into account the transformation of the bonds, strain and elastic energies. Spinodal decomposition ranges of BxGa1-xNyP1-y alloys with compositions x = 0.01, 0.013, 0.015 and 0 ≤ y ≤ 0.08 are demonstrated up to 1100°C, and to BxGa1-xNyAs1-y with compositions x = 0.008, 0.01, 0.011, 0.012 and 0 ≤ y ≤ 0.06 are demonstrated up to 1180°C. The estimations show that the decomposition ranges are larger when the transformation of the bonds is not considered.