Hyperfine structure analysis in the even configuration system 4f25d6s2 + 4f25d26s + 4f36s6p + 4f35d6p + 4f25d3 of Pr I has been performed applying a semi-empirical method. In the analysis the last experimental results have been used. Experimental radial parameters anlκk and bnlκk have been calculated for the configurations under study. The hyperfine structure of 546 energy levels have been interpreted. Extremely strong configuration mixing effects for almost all investigated levels have been observed.