The article is devoted to the issues of students' cognitive process in learning foreign language for specific purposes, which is critical to students' further professional maturing as specialists. The authors of the article give characteristics to methods of developing students' cognitive interest. Interdisciplinary integration is stated as a tool to solve tasks set before teachers. Implementation of interdisciplinary connections within learning foreign languages undergoes several stages. The article analyzes each stage of implementing interdisciplinary ties while learning foreign language. The article concludes that interdisciplinary integration facilitates developing students' cognitive interest, promoting motivation and mastering methods of research activity.