The purpose of this research were: (1) to describe type  of using code switching and (2) to describe the strategy behind the use code switching  made by English teachers in English language teaching and learning at SMAN 1 Padang Sago. This research used descriptive qualitative design. The  population were all English teachers in the school who taught English subject for 10th, 11th and 12 th graders in the 2019 academic year . The purposive sampling technique was employed in the research  in which the total sampling  were all 5 English  teachers. Instrumens to collect the data were observation chceklist and interview. In the observation checklist, all teachers’ utterancess were categorized according to the types and strategies of the code switching belong to. To determine the frequency of the type and strategy of the code switching emerging in observation checklist, the numberof the type and strategy that emerged were count manulay. Then, the percentage formula   was used. Then, the interview was used to validate the result gained from the observation checklist. Finally, among 110 utterances , it was found there was 4%, of  tag switching used by the tecaher,  inter-sentential switching was 36%, and intra-sentential switching was  60%,. On the other hand,  among 10  strategies of code switching proposed by Hoffman (1991), it was found that  the teacher preferred to use only 4 strategies only of which are for  scosiisted of expressing solidarity 48%, interjection7%, repetition 28%, and clarification19%).