One of the substantialpart of the professional competence of a teacher of sewing profile is design competence. However, the peculiarities of its formation on the basis of modern technologies, in particular the tectonic approach, have not become the subject-matter of an independent research yet. The tectonic approach is used in the technology of construction and design of garments in developed countries. The development of information technologies in the field of light industry requires new approaches to solving problems of formation of design competence, which can be achieved through the usage of the tectonic approach. Consequently, the aim of the article is to characterize the conceptual and methodological features of the formation of design competence of future teachers of the sewing profile at professional educationinstitutions on the basis of the tectonic approach. The set task was performed on the basis of literature analysis by the methods of systematic, comparative analysis for generalization and systematization of referencesources and scientists’researches in order to determine the basic concepts of the given theme. The analysis of documents, in particular curricula and programs of professional disciplines, was used. Based on the analysis, we chose the way of formation of design competence on the basis of the tectonic approach by the means ofinterdisciplinary approach. Analysis of the training of future teachers of professional education institution, the curricula and the academic programs of various disciplines allowed us to claim that they had objective opportunities for the formation of the competence, namely: "Design of garments" and "CAD (computer-aided design) in the garment industry". The analysis of the aim, tasks, the maintenance of discipline allowed us to define that the central place in the decision of the problems, outlined in our research, belonged to modules "Modern process of clothes design", "Problem-solving project technology". The tectonic approach was introduced in these thematic modules. During a long period of time we were developing and testing a non-calculation method of designing women's topwear. The attempt to automate the process of designing a women's topwear was made. Development ofbasic model of clothing in an automated mode greatly facilitated, simplified and accelerated the designing of garments. The process of making sewing clothes began to take less time, leaving more time for creativity. The application of the non-calculation method of designing in manual or automated modes for the designof clotheswith usage of the tectonic approach led to the formation of design competence of future teachers at professional education institutions.