Jargon is a closed language system. Since the evolving and progessing of technology, people now have more and more opportunities to approach that. Some jargon are also mixed into general languange system which is so called non-specialization of meanings of jargon. The main objective for the essay is to dig out the reason behind. Major material I use in the essay is Modern Language Encyclopedia. I take more than 5252 terms which are jargon of semantic generalization as reference to further dig out seme in metaphorical concept become new meanings through sememe analysis. In the essay, we study the reason for general use of jargon of historical development and evolution of sememe in Modern Language Encyclopedia. I aim to use the research as a starting point to know the research of jargon in Taiwan.