Abstract. In this article, a system of logical equations is created using logical functions through methods of expressing the relationship between symptoms of diseases and the diseases themselves in the language of logical algebra. The purpose of this task is to identify obvious connections between diseases and their symptoms and apply it to a specific patient. Development of a software project using the object-oriented design method based on an algorithm for solving this problem and a calculation algorithm using modern programming languages. Using the software developed on the basis of the project, specific solutions to the problem were obtained.