The analysis of some aspects of a considered problem in case of initial impact damage is a subject of the presented research. First of all dimensional analysis allowed to establish some regularities of the stress state in impacted transversal-isotropic composite. The analysis of the stress state in a zone of impact allows obtaining some qualitative judgments and quantitative estimations of character and the sizes of a zone of impact damage. Different criterions of the stress state as a cause of destruction at impact were used (see Figure). That analysis can give the sufficient information for the approximate prediction of On the one hand the mechanism of self-supported destruction is one of the most damaging, and with another, for its studying criteria of linear fracture mechanics can be effectively used. It is very important also the experimental result that illustrates existence of an equivalent hole for composites with brittle components. The problems of active ultrasonic detecting of impact damage are discussed using results of the special experiment.