The purpose of this study was to investigate the relationship between mathematics self-efficacy, perception of mathematics usefulness, self regulation strategies, and mathematics achievement. For this reason 400 students (200 male, 200 female) were chosen randomly and completed a questionnaire with 3 sub scales (self-efficacy, Middleton, Midgly, 1997, perception of mathematics usefulness, Miller and ai, 1996, self-regulation strategies, Miller and al, 1996). The results indicated that: self-efficacy, perception of mathematics usefulness and self-regulation strategies had a significance relation with mathematics achievement in 2 sexes, the level of this relation was different for males and females, the mathematics self efficacy had a more important relation with mathematics achievement in females than males.