Hearing impaired students are special students because they need special treatment. Then, in Indonesia teacher of hearing impaired students teach by using curriculum that the government design for hearing impaired students as a reference. This curriculum describe that hearing impaired students have to take similar subject with normal students like science, mathematics, social and English language. In learning English, hearing impaired students is important to have good vocabulary knowledge because they can get difficulties when they do not have it. There are many media that the teachers of hearing impaired used to teach new vocabulary such as flashcard, picture, realia and logiko. Then, flashcard is one of media that appropriate for hearing impaired students to learn new vocabulary. This research aimed to know teachers’ perception about the use of flashcard and the effect of using flashcard on the vocabulary mastery of hearing impaired students in SMPLB N 1 Bantul Yogyakarta. Descriptive qualitative was used in this research. In this research, the researcher used interview to get the data. There are two teachers of hearing impaired students as participants. The first finding showed that there were three important aspects at using flashcard in the classroom of hearing impaired students such as the times of using flashcard, function of using flashcard and appropriate activities that teachers use to teach new vocabulary by using flashcard. Second finding showed that flashcard can help hearing impaired students in learning new vocabulary and flashcard also can improve vocabulary mastery of hearing impaired students. Other findings were about the use of other media such as picture, realia and logiko. The teacher also explained some challenges at using flashcard.