Separate results of research of behavior of fiber threads are discussed at the wave loadings raised by cross blow on an exemplar. Specialized installation and a technique of dynamic tests of threads on a cross gap are created. Parameters of an assessment of mechanical characteristics of threads are offered at high-speed wave loadings. The revealed regularities of a dynamic response of threads from fibers with various chemical structures are illustrated by data of tests of polyamide, polyester, hard chain aramide exemplars of threads. Test data showed the considerable differences of properties of these threads in the conditions of the considered type of wave influences. Separately ways of a combination of complex structures of threads from the called strands of traditional structure are considered. Combined threads show considerably larger serviceability at wave loadings. It is established that fiber threads of a class Rusar, formed according to the approved technical specifications, considerably concede on properties to the same threads formed on a mode without orientation heat treatment, at their use as structural components as a part of the studied combined threads. Properties of combined threads on the basis of threads Rusar and polyester strands are subjected to the analysis depending on a line density of fresh formed aramide components.