Grice, H. P., an American linguist, first proposed the Cooperative Principle in 1967, which is an indispensable part of pragmatics. Grice believes that people make more or less efforts for cooperation in order to achieve the purpose of conversation in daily conversation. Sometimes they deliberately violate the Cooperative Principle and produce special Conversational Implicature. This paper analyzes a few dialogues in Little Sheldon from the perspective of violating the Cooperative Principle to explore the actual conversational meaning and illocutionary meaning behind the dialogues.