Chaucer writes his poem with East Midland dialect and plays a significant part in the formation of English literary language. In this perspective, Chaucer′s greatest contribution to the making of English poetic formshall be the iambic heroic couplets he introduced from France. However, unlike Dante who challenges the prestige of Latin with his ″illuminated vernacular, ″ Chaucer′s ″vernacular″ never avoids its vulgar. Instead, against Dante′ sdivine comedy, he parallels the highbrow and the lowbrow, presents a typical secular world in his time which in a large way, leads to his famous mild satiric style according one′s position in the social net. The fact that in Canterbury Tale, Chaucer depictes characters of all ranks in his time but the highest and lowest, well indicates Chaucer′s location in the 14th century British social space. Chaucer′s courteous attitude towards the knight, a man in the lowest rank in his class, maps the social distance between a bourgeois poet occupied by public affairs and his royal patron.