According to methodology of decision making support in innovative projects management, developed on the previous stages of the research, a method of expert's knowledge formalization based on the decision making support ontology, was developed. The method allows to integrate the means of ontological analysis and knowledge representation in the knowledge base creation for decision making support in problem situations. Knowledge base is structured according to the set of classes selected by the results of ontological analysis. Knowledge, which logical system is ordered, is presented in the module of rules. Decomposition of the rule base is performed in accordance with the hierarchy of objects established as a result of modelling. Empirical knowledge for solving the problems of innovative projects management is presented in the form of cases for providing recommendations that can be adapted to a concrete problem situation. Keywords-knowledge base, intellectual decision making support, innovative projects management, ontological engineering, knowledge management, decision making rules, cases of problem situations As a part of the research possibility of using the intellectual knowledge management technologies to improve the efficiency of the project "Reconstruction and technical