As part of solving the priority tasks set in the Address of the President of the Republic of Kazakhstan Kassym-Jomart Tokayev, a significant role is given to the development of the food industry, including dairy products. Big tasks are to be solved by branch science in the field of processing raw materials of plant and animal origin using the achievements of bio- and nanotechnologies to improve the quality, biological, nutritional value and food safety. New approaches are needed to organize the complex processing of plant and animal raw materials in order to improve the economic, social and environmental aspects of the production itself, as well as the life of the population of the Republic of Kazakhstan. Despite the extensive range of processed cheeses, it is constantly updated. This is due to the need to meet the requirements of nutritional science, changing consumer demand, as well as the availability of raw materials and considerations of the profitability of a particular type of cheese. The working hypothesis of the research was the assumption that for the melting of raw materials it is possible to use reagents that affect the active acidity of the medium, stabilize the structure, bind moisture and improve the consistency and organoleptic characteristics of the finished product. The article is devoted to the issue of the process of melting rennet cheeses. The purpose of the article is to show that the melting process is closely related to different forms of raw material protein micelles. In this article, the influence of the type and amount of melting salt on the formation of the structure of processed cheese is considered, the rheological indicators of experimental products are determined in accordance with the scoring of processed cheeses. The indicator of water activity (аw) was established, the microbiological parameters of the experimental products were determined.