Advertising is a key point for enterprises carrying out fierce competition to dominate the big market, which generally applies the Cooperative Principle in order to achieve the ultimate goal of boosting sales. The thesis combines the principle with kinds of English commercial advertisements illustrating the deliberate violation of the principle and its maxims of quantity, quality, relation and manner which creates conversational implicatures, aiming to provide useful directions for advertisers to design more attractive and persuasive advertisements. Advertising is a key point for enterprises carrying out fierce competition to dominate the big market, which generally applies the Cooperative Principle in order to achieve the ultimate goal of boosting sales. the principle and its maxims of quantity, quality, relation and manner which creates conversational implication, aiming to provide useful directions for advertisers to design more attractive and persuasive advertisements.