The article presents a research of the peculiarities of the psychological adaptation of foreign students to the language and national environment in the process of comprehensive study of peculiar topics of linguistics and the history of its formation. The research was conducted on the basis of the use of a comprehensive experimental training program for learning Ukrainian as a foreign language and the history of Ukraine in one academic group of foreign students (12 people). Another group of students studied according to the standard program. The research objective is to demonstrate the positive dynamics of psychological adaptation of students from different countries to the language and national environment in the process of learning Ukrainian as a foreign language and particular aspects of its formation, namely the influence of Poland on the Ukrainian literary language in Western Ukraine in the 20s and 40s of the 20th Century. The urgency of studying this historical period is that the new edition of the “Ukrainian orthography” of 2019 partially intensifies the use of lexical tokens borrowed from the Polish language and orthographic norms of the “Orthography” of 1928. The research results showed that the average score of the final testing of students who studied through the experimental program is 3 points higher than that of students who studied through the standard program. In addition, students of the first group have much higher results from diagnosing the psychological characteristics of adaptation to the national environment. By studying the language and history of Ukraine, foreign students not only much better mastered language phenomena and understood their origins, but also learned about the complex past of our country. The conclusions of the experiment show that the proposed methodology proved itself to be a tool of improving the psychological adaptation of foreign students to the language and national environment of the country in which they receive professional education.