Because of the COVID-19 pandemic, face-to-face classes in primary and secondary schools were prohibited for a significant period of time during 2020 in Hong Kong. Therefore, this triggered many schools to transit from traditional face-to-face teaching mode into e-learning, bringing opportunities and challenges, especially for subjects that rarely used online teaching in the past, such as Chinese language. Using a qualitative research method, five Chinese language teachers at a local secondary school were interviewed and observed. This study aimed to investigate the changes in their teaching approach and their perceptions of e-learning under the COVID-19 pandemic, as well as the factors affecting their use of e-learning tools. Findings indicated that the teachers generally showed positive views on e-learning while no significant change in their teaching approach. The teachers mainly used e-learning tools to facilitate their teaching based on the nature of teaching contents. They believed the effectiveness of e-learning would be affected by students' learning motivation and socioeconomic status. School support and policies were also found to affect teachers' willingness and ability to implement e-learning.