In contrast, we made a study of the distinction between language attrition and the phenomenon of "languages disappearance ", which including language transfer, aphasia and Alzheimer's dementia, language endangerment, and forgetting through the five attributes of generations relationship, occurrence mechanism, target groups, influencing factors and existence forms. We found though they are in the same category of "disappearance of languages", it appears a big difference between them by their nature. Meanwhile, we take a contrast for differences. Therefore, dividing "language disappear" into language macroscopic disappear and language microscopic disappear on further.

Abstract
I. Examination and analysis of language attrition and languagetransfer
II. Examination and analysis of language attrition, aphasia andAlzheimer's disease
III. Examination and analysis of language attrition and languageendangerment
IV. Examination and analysis of language attrition and forgetting
V. On the phenomenon of &quat;language disappearance&quat;
VI. Conclusion
References

• LI XUESONG(Korea South Seoul University, Arts Management)