The present study was done to examine the role of mathematic anxiety on mathematic performance of high school students. Math anxiety is a factor that can affect performance in math. This anxiety is influenced by personal and environmental factors، cultural factors and gender roles too. In this research the effect of this factor son performance in math was assessed. The research method had a correlation design which is categorized in descriptive research. The participants of this study were 300 high school students who were studying in Damghan city high schools in 1389-1390. 150 male high school students and 150 females were selected randomly as sample. The subjects completed the math anxiety Scale (Chiu & Henry، 1990).This scale has four dimensions (mathematics anxiety، learning، problem solving، teacher). Findings showed that among components related to mathematic anxiety، just learning anxiety of mathematic could predict the students’ performance. But there was no difference between male and female students mathematic anxiety.