When teaching foreign students in Russian universities training of qualified specialists requires solving a number of problems associated with teaching special disciplines. In the context of bilingual education, the problem of low level of understanding and assimilation of the content of an English-language chemistry lecture by the medical university foreign students was studied. In the study two groups of foreign students participated: control group and experimental one. During the ascertaining experiment, both groups of foreign students were asked to assess the level of understanding of the content of the oral text of the English-language chemistry lecture and the expression of interest in the subject being studied during the lecture. The level of assimilation of the lecture content was calculated. As a result, the problem of a sharp decrease in the level of understanding of the oral English-language educational material by students during the lesson was discovered. A low level of assimilation of the lecture content was revealed. In order to improve the levels of understanding and assimilation of the content of English-language chemistry lectures by foreign students, the author developed visual aids accompanying the lectures and proposed its use as a tool for solving the problem. The correctness of the hypothesis was confirmed experimentally. It was shown that the use of visual aids increases the levels of understanding and assimilation of the content of an English-language chemistry lecture by foreign students.