This study explored the concerns of dance instructors struggling to instruct practicum class in the COVID-19 situation and examined online class activity factors through qualitative research method. In order to achieve the purpose of this study, 4 dance instructors currently working in arts high school with experiences of instructing online classes in the COVID-19 situation were selected as the targets to conduct detailed and in-depth interviews. As a result, the following findings were gained in this study. First, it is the first time to implement online class for dance course, which is a practicum course, so both the dance instructors and students are having a hard time adjusting to the new educational environment and the results showed that this lowered dance learning effects. Second, online dance class activities involve indirect feedbacks and a lack of communication so it caused difficulties in the inter-action between the dance instructors and students, and there was low satisfaction about practicum class. The educational environment is rapidly changing due to COVID-19 so measures that can enhance the class environment (facility), online teaching methods, and students' attitudes should be considered as priorities in order to heighten the effectiveness of online dance class.