Generally speaking, the candidates on the live TV program, where the candidates get together to have a debate, use many kinds of conversational strategies and tactics. This paper aims to examine the most important conversational strategy, the image control strategies, in these kinds of environment. I will concretely analyze the tactics that are often used for image control strategies. A live-TV debate of candidates is very different not only from a casual conversation but also from general live TV policy debates, which consist of pros and cons on a specific subject. Thus, the participants of `live TV debates of candidates` use different kinds of conversation strategies and tactics. In the case of a `live TV debates of candidates`, the most important strategy is `the image control strategy`. All of the participants use many kinds of positive and negative tactics in order to build their positive self-image and to aggravate the image of the other party negatively. Largely, these tactics violate many principles and maxims of discourse observed in a casual conversation. This shows that the conversation itself has a strategic features. This study concretely analyzes and classifies image control strategies and the details of tactics by analyzing a real TV debates. In addition, we need to explain what kinds of details of tactics are more effective to achieve the goal of image control strategies here after.