Classroom assessment is a major part of the teaching and learning process. The aim of the present study is to investigate the factor validity and reliability of the "Students' Perception of Assessment and Evaluation of Activities Questionnaire" by UJ. In this regard, the Students' Perception of Assessment and Evaluation of Activities Questionnaire was administered to 400 students who were selected from among the students of Mazandaran University through cluster sampling. Cronbach's alpha coefficient was used to examine the reliability of the questionnaire, and confirmatory factor analysis was used to determine the factor validity. The results of the present study showed that this questionnaire has acceptable internal consistency and Cronbach's alpha coefficient in its subtests was between 0.71 and 0.78. Also, the results of confirmatory factor analysis confirm that the questionnaire structure has an acceptable fit with the data and all goodness-of-fit indices confirm the model. Therefore, the questionnaire can be an appropriate tool for assessing students' perceptions of the assessment and evaluation of activities and assignments.