$$ZnCr_2O_4$$ Z n C r 2 O 4 compound is well Known to show the frustration of the spin structure. At 12 K, $$ZnCr_2O_4$$ Z n C r 2 O 4 distorts to break symmetry of the degenerated frustrated spin states by the spin-Peierls-like phase transition, accompanying with the antiferromagnetic ordering. On the other hand, $$NiCr_2O_4$$ N i C r 2 O 4 undergoes a Jahn–Teller phase transition at a temperature of 310 K, differing from the low temperature ferrimagnetic transition temperature $$T_c$$ T c of about 60 K. It is also reported that $$NiCr_2O_4$$ N i C r 2 O 4 shows another magnetic phase transition at about 30 K. These two phase transitions accompanying with the lattice change can be understood by the magneto-elastic interactions. Two interactions, the Jahn–Teller interaction and the spin-Peierls-like interaction are co-exist in $$Ni_xZn_{1-x}Cr_2O_4$$ N i x Z n 1 - x C r 2 O 4 system. In this report the $$Ni_xZn_{1-x}Cr_2O_4$$ N i x Z n 1 - x C r 2 O 4 compounds with x = 0.8, 0.6 and 1 are investigated by the X-ray diffraction measurements. From these measurements the crystal structures are determined. The full width at half maximum and integrated intensity give the fruitful information for magnetic elastic interactions.