The study aimed at investigating the implementation challenges of CLT in Chongwe District Public Secondary Schools. Case Study design was used in the research which studied 41 teachers of English Language that were selected purposively from the 6 public secondary schools. The research employed qualitative method of data collection and semi structured interview schedules were used to obtain information from the respondents. The findings of the study reviewed that the implementation of CLT were affected by various factors some of which were attributed to the teachers and include among others; inadequate training in CLT, lack of awareness of the syllabi specifications and limited time for development of CLT materials and activities. Pupils were also reported to be negatively affecting the implementation of CLT because of their low levels of English Language proficiency among other factors. Lack of teaching and learning materials, structural exams and large classes were among other factors attributed to the education system. The research made recommendations which included the need for retraining of teachers in CLT.