Description: The problems connected with the forest fires prevention and liquidation differ the big dimension, complexity of interrelations between variables and fast change of conditions with which should satisfy received decisions. Now most a powerful tool of the specified problems realization are intellectual systems of decision-making support (ISDMS) with system of monitoring of object and environment on the basis of geoinformation system (GIS). In structure ISDMS there is a dynamic expert system (DES), functioning in a contour of a feedback with object in which there are problems. It is necessary to represent the decision of these problems to the person making of the decision (PMD) for their realizations on object as operating influences in real time.
Keywords: dynamic expert system, an extreme situation, intellectual system, geoinformation system, system of support of decision-making