This paper presents the results of the investigation on analogies in two geometry textbooks for 12^th grade students in Vietnam. The findings are that analogies in the textbooks are used for the below purposes: using analogy (analog) is to introduce new lesson as a extension of analog; using analogy as a visual tool is to help students understanding the meanings of new knowledge in an easier manner; using analogy is to introduce a new formula without its proof and using analogy is to motivate students. However, analogies used in the textbooks are mainly simple, verbal and structural, and are not used to enhance students’ learning activities.