Etymological analysis is one of the important techniques of thecomparative - historical method, which is correlated with other techniques of thesame research methods and other related techniques. Etymology analysis needs toassure systematicality, comprehensiveness and practicality while conductingresearch on specific subjects. The system of Sino-Vietnamese elements which arecommon, modern, and highly capable of forming words is an appropriate researchsubject for the application of etymological analysis. Sino-Vietnamese elements arestudied at single-element and multi-element levels, simultaneously explaining thecauses of similarities and differences. The findings of the study offer practicalimplications for Vietnamese users to understand correctly and have ability to useSino-Vietnamese elements in language practice. The study of Sino-Vietnameseelement system using etymological analysis will lay a foundation for the researchinto linguistics and culture, sociological linguistics, cognitive linguistics, andapplied linguistics. Method for analising etymology is performed applicably inunderstanding deeply the layers of meanings of an important word, accounting fora large number of words in Vietnamese and relationships between language andother fields such as culture, literature, ideology, history and play an important rolein improving educational quality in highschools