Purpose: The purpose of this research was to evaluate the effectiveness of career training on the development of the career path of the mentally disabled students. Methods:This research was a semi-experimental using a control group and pretest-posttest method. The sample was a group of 72 students in the third, fourth, and fifth grades in primary school. The sample was selected randomly based on clustered sampling from two schools and students were put into the experimental and control groups. The data was gathered using a researcher-made questionnaire based on Gatfredson’s theory and was analyzed by one-way variance analysis and covariance analysis. Results: The data showed that there was a significant difference between the mean scores in the experimental and control groups and a significant difference between the careers’ cognitive map of girls and boys (p<0.001). Conclusion: In general, the career training effects on development of career in  mentally disabled students.