Textiles are an integral part of everyday life. We meet with them in any setting, whether personal, work or social. Textiles are among flammable organic polymeric materials, so it is also necessary to deal with them from the point of view of fire protection and safety. The aim of the diploma thesis was the evaluation of fire-technical characteristics of natural fiber based textiles. The textiles were evaluated by the method of the flame propagation velocity along the surface of the sample where we were informed by STN EN ISO 6941 and by the method of determination of combustion heat according to STN ISO 1928. Eight samples of textiles based on natural plant fibers were tested: chemical: viscose (base is a natural cellulose polymer) and blends: cotton, wool, flax, cashmere, viscose at various percentages. The fabrics were different in structure (knitwear, fabric), different basis weight. All fabric samples were ignited and the superheat reached the top mark, which was the test parameter monitored. Exceptions were cotton fabrics with flame-retardant finish, which did not burn as the only flame after the flame. The flame propagation rate ranged from 0.52 cm / s at 100% wool to 5.05 cm / s at 100% cotton. In the case of combustion heat, the results of the values ranged from 15,195 J / g in a 100% Vs sample to 21,806 J / g in the Vs / Vl / Ka mixed fabric.