Teaching with analogies is an effective teaching strategy. Therefore, teachers from different countries have been studied and applied this strategy to teaching specific subjects in secondary schools. The study analyzed  20 lessons in the chapter “Coordinate Method in space” (Geometry 12) which were given by 18 mathematics  teachers at the secondary schools in Mekong Delta region (Vietnam), and the results showed that only 5 lessons in which teachers used analogical reasoning to help students construct new knowledge.