In this paper, radio Doppler factors have been used to correct the obs
erved data of BL Lac objects and OVV quasars. The corrected data fit t
he Hubble relation better than do the uncorrected ones. Besides, some
properties of these objects have been discussed. The results suggest t
hat BL Lac objects and OW quasars are a single class with strong beami
ng effect, and that beaming effect be associated with redshift.