The article “Analysis of the Inertial Parameters of Fire Detectors” is devoted to examination of different parameters of fire detectors, as well as to the research of operation principles of fire detector and its construction solution. Parameters and construction peculiarities of smoke, heat, flame and gas detectors are described in the article. Special attention is paid to flame detection principles of different detectors. For more convenient perception of the material, the description of fire detectors is given in logical sequence, on the basis of detector classification according to fire detection factor. In the practical part of the article given comparison of different smoke and heat detectors is made. While burning different kinds of fuel, the time of detectors’ reaction is recorded. In the end of the article the conclusions on practical part are given.