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Influence of enzymatic treatment on morphological structure and physical-chemical Flax fibre's properties and metrological yarn's parameters. The development of the textile industry is focused recently on the technology processes unfriendly impact on the natural environment. Therefore, the enzymes are welcome as the finish treatment agents, as they are completely bio-degradable. Optimal selection is a challenge. Some authors claim, they make breaches in the fibre's structure, depending on the treatment intensity. The quality of flax fibres, mostly considered for technical applications is the result of the processing. The goal of the research presented is the effect of the enzymatic processing on the structure alterations and properties of the fibres, as well, as the changes of the yarns metrological parameters. The parameters of applied enzymatic means were shown including doses, pH, temperature and time of treatment. The results include the chemical composition, mass loss, mean polymerisation rate, the white rate, moisten ability. The mechanical properties were also determined. The conclusions are: Applying the enzymatic treatment as the support to the bleaching with hydrogen peroxide leads to the remarkable white factor improvement, especially if used in the preliminary stage. The fibre gets more clean and flexible while retaining its durabilit. When applying the cellulose-lytic treatment, the fibres get less smooth, which is more convenient for yarn spinning. When applying the pectin-lytic treatment, the fibres get more smooth and clean, which leads to make more shiny and somewhat 'cold to the touch' products.