The article is devoted to study of problems of microtraces classification at the general theoretical and scientific forensic level with subsequent extrapolation to microtraces which form a typical trace evidence picture of forensic characteristics in terrorist nature crimes. The analysis of scientific approaches to the definition of microtrace allows us to identify and outline main features typical for this definition, namely: small size; small amount of substances and materials: invisible or faintly visible under normal conditions of observation; peculiarities of their detection, record, seizure and research. The classification of microtraces based on various grounds is provided. Thus, according to organization of matter (form of physical embodiment), microtraces (microparticles) are divided into: single physical formations (individual physical bodies with a stable form); substances (materials) that do not take the from of an individual body (liquids, powdered substances). In accordance with immediate source of origin, micro-objects are classified into two large groups: parts of natural origin (from natural objects); parts separated from objects that are largely processed or man-made. In the first group, four subgroups must be distinguished: microtraces that have separated from the human body; micro-objects from animal; microparticles from plants; micro-objects of mineral nature. When considering micro-objects in conjunction with carrier objects, they are differentiated by a trace-forming object and the type of contact with the carrier: overlay; inclusion; layering.
 It is noted that the most typical ways of committing terrorist nature crimes are the use of firearms, cold weapons and the use of explosive weapons and / or explosives.
 Taking into account the fact that manufacture, possession and use of explosive weapons or explosives for the investigation of crimes of this category affects the criminal law qualification, tactics of individual investigative actions (eg site inspection, search, etc.). Microtraces can be classified according to conditions and time of their formation into the following groups: formation of microtraces that are associated with illegal manufacture, acquisition, storage, sale of explosive weapons or explosives; microtraces of preparation of explosive weapons directly before the explosion; microtraces of explosive weapons. The analysis of the essence of these situations allowed the author to establish and provide an appropriate list of typical microtraces in investigation of terrorist nature crime.