In communication, no matter the speaker abides by or violates the Cooperative Principle will lead to implicit information, where there will be information gap. The speaker must bridge the gap by self-enrichment or pragmatic enrichment according to the current context. Based on the drama Cba Guan written by Mr. Laoshe, in order to try to point out the relevance between the lexical meaning and conversational context, the paper studies the information gap and pragmatic enrichment and at the same time applies the relevance theory to analyze the material.