Promoting health behaviors in teachers can have important effects as a behavioral model in promoting health behaviors in the whole society, and this research was conducted with the aim of predicting the health behaviors of high school teachers in Mehriz county based on the body mass index and the amount of physical activities. The research method was correlational. The statistical population included all male and female high school teachers in Mehriz county. The sample size was 197 people and the sampling method was convenience. To assess Physical activity rate and Health Behaviors were respectively used the short form of the International Physical Activity Questionnaire of the World Health Organization and the Health Promoting lifestyle Profile (HPLP-II). Pearson's correlation and regression analysis were used to analyze data with SPSS software. Based on research findings, A direct and significant relationship between physical activities and health behaviors (r = +0.761, P < 0.05)   and statistically significant inverse relationship between body mass index and health behaviors of teachers of high school teachers of Mehriz county  (r = -0.335, P> 0.05) were observed. The coefficient of determination obtained showed that 11.2% of the variance of the health behavior variable is predicted by the body mass index and has a negative effect on it, and 57.9% of the variance of the health behavior variable is predicted by the independent variable, i.e. previous physical activities. It can be seen and has a positive effect on it.