The paper will explore the poem John Milton's poem"On the Morning of Christ's Nativity"from the perspective of traditional cosmology in the Occident. Many cosmic images in the poem will be expounded to the full interpretation of the po?em. On the whole, the poem combines the ideal with reality. It longs for peace and harmony in the world and appeals for the re?turn of justice, truth and mercy to man on the earth. With the birth of Christ, man has the chance of being redeemed.