Abstract This study used eight genetic structures of Linum Usitatissimum L. (Sakha1, Sakha2, Sakha3, Sakha5, Sakha6, Giza, Syrian and Poloni) their half-exchange satire obtained according to the second method proposed by Griffing (1956). Genetic compositions (8 parents + 28 hybrids) were planted in fields Faculty Agriculture/University Kirkuk winter season (2021-2022) full random sectors (RCBD)...