(1) Role paly models human interactions to provide a chance for students to exercise, creating effective and memorable experiences for learners. It places learners in a situation where they are asked to take on different roles and to accomplish their specific tasks, including problem solving. They offer an opportunity for learners to practice using the language in the right place, at the right time. The strength of role-play is that it presents an opportunity for authentic and spontaneous communication because learners are placed in realistic situations and they can “have the opportunity to use and practice the sort of language, particularly the vocabulary related to that situation, so that learners are rehearsed for the real life.”In addition，they can express what they want to say whenever the situation calls for it. Role-play is of great significance as it develops students' both receptive and productive skills.

(2) It develops students' listening skill. While role-playing, students practice listening when trying to get information from their partners. It develops students' speaking skills: answering the questions according to what are heard, producing responses based on given cues, it is clear that this activity can practise speaking skills. Promoting knowledge acquisition: students in role-play are found to use search and retrieval strategies more frequently than students in traditional learning situations. During the process of exchanging, there will be the information transferring from one peer to the other. Individual students are able to increase their mastery during this process: During the entire process, students are motivated to search language in their vocabulary storage and select the proper language to use. What's more, it also can stimulate students' interests and activate classroom climate to keep students engaged in class. With role play, students act out certain situations. Teachers generally try to make these situations fun and interesting.

(3) Improving social competence: the true mastery of a language involves communicative competence. While role-playing，individuals work together， they must interact with each other to promote each other's success，thus increase students' social skills, conflict-management and compromise.