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We carry out 400 keV Ne ion irradiation damage experiments at cryogenic temperature (about 77K) on poly- crystalline HoTiO pyrochlore.The irradiation fluences range from 2 × 10 to 1.3 × 10 ions/cm, corresponding to the peak ballistic displacement damage of 0.075-0.487 in units of displacement per atom (dpa).The value indicates the statistical average of the fractional number of lattice atoms which have experienced a lattice displace- ment.Irradiation-induced structural evolution is examined by using grazing incidence x-ray diffraction (GIXRD) at x-ray angles γ=0.25° and 3°.It is found that the irradiated layer is volumetrically swelled as compared with the underlying non-irradiated substrate and the volume increase in the irradiated layer is contributed mainly to the irradiated ion fluence.