Academic dishonesty or cheating is behaviour that is done by the students, they have become a serious problem in the world. One of the functions of guidance and counselling teacher is to prevent the occurance of bad behaviour. So, guidance and counselling teachers should strive to prevent cheating behaviour. The purpose of this study is to describe teacher guidance and counselling efforts in preventing cheating behaviour, and to examine whether there are differences in the efforts of guidance and counselling teachers in preventing cheating behaviour in terms of their length of working and at the school where they work. The population are guidance and counselling teachers in junior and senior high school, amounting to 237 people. The determination of the sample by purposive random sampling technique by considering the length of work of the teacher, with sample is 100 guidance and counselling teachers. Instrument used is rating scale. By using the hypothetical mean, research results show that 33 % guidance and counsellor teachers quite optimal efforts, 29 % optimal, and 11 % very optimal to prevent cheat behaviour. No different effort guidance and counseling teachers in terms of long work and school work place.