Onssori, the lord of poets at the court of Mohmoud Ghaznavi, is one of the greatest eulogist and elegist of the Persian poetry. Some 70 odes and 77 couplets and a number of scattered distiches have remained from him. His successors took different positions on Onssori: Some criticized his eulogy, some mentioned the luxuries he had gained as a result of panegyric, and some admitted his mastery and were influenced by him. The language of Onssori is very similar to that of the poets of the Samanid Dynasty in terms of lingual obsolescence, however, he used more Arabic elements in his speech.He preferred to compose Moghtazeb (improvised) odes, or odes with short lyricd. His odes had been composed totally on the basis of 9 common and much used Persian rhythm, with the most frequent ones being Bahr-e Mojtas Mosamman Majnoon Mahzouf"(%37). Most of his odes (%87) have no rhyme, however, half of his couplets end in rhymes. He attached special attention to alliteration, phonetical assimilation at the end of distiches, present tense and extra puns, rhymed, derivations, addition and division, use of similar words, synonym and antonym, question and answer and good reasoning. Having been a poet of eulogy, he also paid attention to the common and general meanings, to the extent examples of his poetry have been mentioned 76 times in Dehkhodas Amsal-o-Hekam. The most important expressive element in Onssori's poetry is simile. Among the similes, eloquent, sentimental, rational and imaginative similes and Mozmar (covert) similes are appreciated by him. Onssori is the first poet to have used rational and illusive similes to a great extent, and other poets followed him in this respect. Onssori is a generous and realistic poet, moderate in eulogy, a man of rational knowledge and a man of reason with an artistocratic insight, and these characteristics were reflected in his poetry.