The purpose of the current research was to determine the Psychometric properties of the Persian version of the Questionnaire of Attitudes towards Doping in Fitness (QAD-Fit). For this purpose, 190 female athletes (76 people) with an average age of 26.92 ± 6.53 and men (114 people) with an average age of 28.72 ± 6.9, semi-skilled in Semnan city completed the questionnaire online. After the translation-re-translation technique and confirmation of the face validity of the questionnaire by three experts, the initial pilot of the questionnaire was done to fix minor problems. In order to determine the construct validity of the questionnaire, confirmatory factor analysis based on the structural equation model, the internal consistency of the questionnaire using Cronbach's alpha coefficient and its stability using the correlation coefficient using test-retest were used. The results in the reliability estimation of the questionnaire factors showed that the alpha coefficient for the whole questionnaire with 16 questions was 0.83 and the internal consistency of other subscales of the questionnaire, which includes intentions, attitudes, mental norms and beliefs, was 0.82 respectively. , it was 0.8, 0.84, 0.82 and 0.83, which is acceptable. In examining the temporal reliability, the results of the intraclass correlation coefficient in all subscales and the overall score of the questionnaire have been evaluated favorably. Therefore, it can be stated that the Persian version of the Doping Attitude Questionnaire in Physical Fitness is considered a valid and reliable tool to evaluate the attitude towards doping in physical fitness of athletes.