The sample of the research in which the relationship between the perceived social support level and the risky behaviours of high school students’ consists of 433 high school students going on studying in different types of high school in the district of Şehitkamil and Şahinbey, in Gaziantep. The research was figured according to descriptive methods and relational screening model. In order to collect data, “Perceived Social Support Scale (PSSS)” developed by Yıldırım (2004), “Risky Behaviours Scale (RBS)” developed by Gençtanırım Kuru (2010), was used by the researcher. And “Personal Info Form” was used by the researcher in order to get demographic information. In the study, the normality of the data was tested, and the Mann-Whitney U Test, Kruskal Wallis Test, and Spearman Brown Sequence Differences Correlation Coefficient were used. In consequence of the analysis of the data, it was observed that there was a negative relationship between the total points of SPSS and the points obtained by its subscales and the total points of SRB and the points obtained by its subscales. However, a significant relationship wasn't observed between the points of one of SPSS's subscales, the level of social support perceived by a friend, and the points of one of SRB's subscales, alcohol use, smoking and feeding behaviour.