Abstract: The qual i t y di f f er encesofwhi t e Leghor n f er t i l e and i nf er t i l e eggsdur i ng t he ear l y i ncubat i on st age ( 0~4 d) wer e i nvest i gat ed.The r esul t sshowed t hatt he aver age dai l y wei ghtl ossoff er t i l e eggs ( 0. 71% )wasdi f f er entf r om i nf er t i l e eggs( 1. 00% ) .The pH off er t i l e eggsal bumen i ncr eased f i r stand t hen decl i ned,i tr eached t op ( 9. 44)when hat ched 2 d,t he pH ofi nf er t i l e eggsal bumen r ose sl owl y.The al bumen hei ghtoff er t i l e eggsdecr eased atbegi nni ng and i ncr eased l at er ,i t r eached t he l owest val ue ( 7. 0 mm) when hat ched 2 d, t he al bumen hei ght of i nf er t i l e eggs decl i ned. Ther e was no si gni f i cantdi f f er ences i n t he haugh uni toft wo ki nds ofeggs dur i ng 0~3 d.Yol k col orchanged f l uct uant l y i n f er t i l e and i nf er t i l e eggs.Dur i ng t he ear l y i ncubat i on st age,shel lt hi ckness off er t i l e eggs became t hi nnerand t he numberofai rhol e i ncr eased,butshel lt hi cknessand t he numberofai rhol e ofi nf er t i l e eggshad no si gni f i cantdi f f er ences .