This paper analyzes two plural markers in two classifier languages—-men in Chinese and -tati in Japanese, and summarizes that in each language, two completely different plural markers coexist, one stands for cumulative meaning, the other associative meaning. Besides, two cumulative plural markers and two associative plural markers are compared separately, and the reasons cause their differences are explored. By proving plural markers do exist in classifier languages like Chinese and Japanese, we argue against Nominal Mapping Principle proposed by Gennaro Chierchia(1998)and hope the present study can help readers further get a clear understanding of the relationship between plural markers and classifiers.