"ban-A-bu-B" format is a popular format in spoken expression in modern Chinese. Basing on the full analysis of the nature and characteristics of the variable part "A""B" and the invariant part of "ban" and " bu ", this paper holds that the format is a low-level expression with a format meaning: 1. When the semantemes of A and B are opposite, the whole format emphasis on "ban-A", which contains the expression of soft rejection and disgust;2. When the semantames between A and B are similar, this format contains inappropriate and disagree expression to things or events, etc. This kind of format has a function of low-level negative evaluation and the function of high-level subjectivity.