The purpose of the research was to describe the cognitive load of seventh grade students in teaching bilingual mathematics based on cognitive load theory. According to cognitive load theory, the student’s cognitive loads consist of intrinsic cognitive load, extraneous cognitive load, and germane cognitive load. Trough managing the intrinsic load, reducing the extraneous load, and increasing the ... [Show full abstract] germane load, the process of getting information can be more effective. So, the learning process can be more effective too. The result of the research showed that intrinsic load was influenced by the number of element of interactivity of material that learned, the germane load is influenced by the design of learning and a mental effort of the students in formed the scheme of knowledge, extraneous cognitive load is influenced by the way of teacher in presenting the material, language used, psychological condition of the students, and external distraction.