The goal of this study is to determine the relationship between burnout and personality traits and illegal believes in consultants. The present society consists of 142 consultants in Yazd city among which 100 person were selected in a simple random manner. Muslesh burnout (MBI) personality Big Five Operands (NEO) and Jones’ Illegal Believes (IBT) questionnaires were distributed among them and answers were collected and analyzed using Pearson correlation and regression analysis methods. Results showed that burnout has a positive and meaningful relationship with illegal believes and neurosis personality traits and responsibility; and a negative meaningful relationship with extroversion and flexibility. Results also showed that illegal believes and five components of personality could best predict the burnout in consultants. Finally, it should be mentioned that attention to personality traits in recruitment of consultants and changing illegal belives can reduced burnout. © 2014 AENSI Publisher All rights reserved.