The study aimed to measure the effectiveness of using the mechanisms of positive psychology in developing the self-concept of the students of the second cycle of basic education. The number of the sample members was (79) students who were distributed into two equal experimental groups (39) students. The program based on the mechanisms of positive psychology was applied to them. And a control group (40) students on whom no program was applied, and the self-concept was measured by the six factors scale of self-concept (task achievement, moral, vulnerability, strength, talent, ability to love) Six Factor Self-Concept Scale SFSCS) prepared by the researcher based on On Stake's conception (Stake, 1994), and using the t-test, the results indicated that there were statistically significant differences in the level of self-concept between the tribal and remote measurements of the experimental group members in favor of the post-measurement, and there were differences in the level of self-concept between the experimental and control groups in the post-measurement. In favor of the experimental group, and there were no differences between the post and follow-up measurements for the experimental group, and the study recommended the need to pay attention to strategies and mechanisms of positive psychology in a way that suits the characteristics, needs, tendencies and attitudes of students.