Hong Kong, a leading city of China, is a place with students having good examination results but being regarded as incapable of thinking critically. In 2005, the Education Bureau decided to make Liberal Studies as a core subject and aroused controversial debate. This change, proposing to use a core subject to nurture student critical thinking skills, is a drastic curriculum change in this society. This study, inquiring into the perceptions and practices of teachers teaching Liberal Studies, consists of two research questions. First, how do teachers perceive the aims and nature of the core subject Liberal Studies in the new curriculum? Second, how do they nurture the critical thinking habits of students in their classroom? Qualitative study was conducted to investigate teachers’ perception and practices of critical thinking in Liberal Studies. Both interview and documentary analysis are used in this study. First, the researcher interviewed five Liberal Studies teachers, who were experienced in teaching Liberal Studies. Each teacher individually attended the interview for about one hour. The researcher audio-recorded the conversation and transcribed word by word. Second, in order to follow up with interviews, teachers were invited to provide supporting materials such as teaching plan for further analysis. The study showed that a positive side in this reform. Teachers with strong perceptions for nurturing critical thinking skills of pupils were empathetic in teaching Liberal Studies. Teachers had initiated various methods to provide students opportunities to reflect on thinking and learning, which were drastically differed from traditional culture of Hong Kong. This study also showed that teachers’ perception of critical thinking skills in Liberal Studies also influences their practices in teaching the discipline. However, with the traditional pedagogical culture and examination bounded system, shifting from transmission of knowledge to nurturing critical thinking