The article reviews the process of developing training content of the on-line course on the project method for Mathematics teachers teaching at higher technical universities. The study presents the first stage in developing training materials and a model for the structure of the on-line course «Project Method in Teaching Higher Mathematics», which is in open access on the «Higher School Mathematics Teacher» educational platform. The original version of the course was designed on the basis of the findings of a survey among the Mathematics professors. It helped to find out the level of their awareness about involving the project method of training in engineering students, and gave good reason to conclude that it is advisable to introduce an on-line course to enhance their qualifications. After uploading to on the platform the original version of the course, we managed to organize a discussion of the proposed content, structure and modes for submitting the course materials on the forum. The article discusses the process of modifying the course compo-nents, improving training material during the forum discussion. There was ground to conclude that it is advisable to introduce the on-line course into the process of training Mathematics teachers to improve their qualifications. The analysis of the feedbacks from the course users on the forum, confirmed that the variety of submitted forms of course materials and the proposed top-ics satisfied the preferences of the course users with regard to the perception and awareness of the educational information.