Abstract: The research presented in this paper focuses on the dimension measurement of nuclear fuels or materials in the hot cell using coordinate measuring machine（CMM）, which was structural adjustment to adapt to the hot cell environment. The automatic measurement was achieved by means of using coordinates to establish the position and sectional measuring with special fixture. Experiment measurements involve the thickness of plate-type fuel element（FE）, the diameter and ovality of tubular fuel element, shape dimensions of fuel assembly（FA）, and other dimensions. The research results showed that the coordinate measuring technique could be applied in the hot cell for post irradiation dimension measurement, which applied to measure different dimensions with a high measure precision of 2 μm.