First step to know the suitable major is finding intelligent, interest, and characteristic. If students know their intelligent, interest, and characteristic, it is easy to choose the suitable major. Some students have already known what they wanted to major in since they were infants, while others get into their junior or even senior year without finding their interest. If students do not know what their intelligent, interest, and characteristic are, they are possible to have consultation with a psychologist. Consultation takes time because they have to go to a psychologist and should make an appointment beforehand. For only a consultation, it would spend a lot of money, if students need consultation in several times, of course it will take a long time and spend a lot of money. That is the reason why Expert System for Choosing University Major (ESCUM) developed. The ESCUM can be used as a tool which can help to find the intelligent, interest, and characteristic without having to waste time and money. Keywords: expert system, choosing university major