The purpose of this paper was to present how the upper secondary school students at Khon Kaen Sports School could develop their English speaking skill according to the teaching-learning of English with emphasis on speaking. The writers also presented the principles and techinques of some language teaching methods appicable to Thai students so that foreign language teachers can apply them in their teaching. Moreover, the writers presented the contents and activities for the students at Khon Kaen Sport School, sample lessons, the methods of teaching and additional suggestions for the development of students’ speaking skill.