Abstract: The article focuses on understanding and examining the constitution forms of library and information terms in English and in Vietnamese. At the same time, the author would like to evaluate the similarities and differences in the method to constitute library and information terms in English as well as in Vietnamese. The results have shown that in both language, most terms are formed by word combination, which is a popular way of word formation and has the largest productive ability of all languages. However, because English is a metamorphic language, so it can be said that the forms of term constitution in English is more diverse.