The Curie temperature of(Nd1-xPrx)2Fe14CoyB compounds（x=0,0.2,…,1.0 and y=O,2,4,6,14）hasbeen determined with AC initial susceptibility measurement.It was found that the variations of Curie tempera-ture with x is not linear for y=0 and 14,whereas it is linear for other values of y.The lattice constants of(Nd1-xPrx)2Fet14B were determined by using X-ray diffraction.The lattice expansion was mostly along the caxis,whereas that along the a-axis remained practically zero for the whole series.It is suggested that Pr atomsmay show site preference in R2M14B compounds（M=Fe or Co）.Due to the substitution of Co for Fe.thetendency of site preference of Pr becomes less pronounced,which may be attributed to the decrease of differ-ence of crystal electric field（CEF）acting on the two rare earth sites with the introduction of Co or Fe.In con-trast to that of the Pr atoms,the site preference of Co iu（Nd（1-x）Prx）2Fe（14-y）CoyB compounds does not depend onthe composition of the rare earth sublattice（R=N d or Pr）.
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