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A series of experiments has been conducted on the Farsi language in the University of Tehran during past three years. The goal of these experiments was to establish the characteristics of Farsi text with respect to different retrieval models and weight schemes. These experiments included different Fuzzy methods and Vector Space, Probablistic and N-gram models of retrieval. The results show that vectore space model with ltu. Lnu weighting outperforms other models and weighting schemes.