[en] A comprehensive investigation of the superdeformed bands observed in ^{142,143,144,147}Eu was given. The fluctuation in the transition energies has been removed. The smoothed transition energies were fitted by the ab-expression or its modification. The spins of these bands, except for band 4 of ¹⁴⁷Eu, have been assigned conclusively. The exit spin in ¹⁴³Eu was proposed to be 29/2, different from that asserted to be determined experimentally but remains to be confirmed. The corresponding values in ¹⁴²Eu and ¹⁴⁴Eu(a) are 21 and 28, lower than those proposed in the literature by 6 and 8 units, respectively. Two pairs of superdeformed bands in ¹⁴⁷Eu, i.e. bands 1,5 and bands 2,3 were proposed to be signature partners. The exit spins are 53/2 and 63/2 for the former pair, and 43/2 and 41/2 for the latter pair. In addition, both of them have a rather large de-coupling constant (≅-1), implying they are of K = 1/2 and built on the single particle level ν[651]↓ or π[530]↑. This assignment may be helpful for the studies of the so-called identical bands and pseudo spin problem. The signature partner pairs observed in ^144,148Eu are not included in the investigation