Introduction: Hoarding disorder is a complex and not well-understood psychological state that affects millions of people worldwide.
Aim: The purpose of this study was to examining the relationship between experimental avoidance and autism spectrum traits and hoarding behaviors with the mediating role of hoarding cognitions.
Method: The present study was descriptive of correlational type and the statistical society of this study was all students of Birjand Azad University in the academic year of  2016-17. The sample consisted of 369 people who were selected by random cluster sampling and completed the Saving Inventory-Revised, hoarding cognitions questionnaire, experiential avoidance questionnaire and autism spectrum quotient.
Results: The findings of the study showed that experiential avoidance has a positive and significant relationship with aspects of hoarding, while the autism spectrum traits have no relationship with the cognitive and behavioral aspects of hoarding. In addition, a finding on mediating role showed that in the proposed model, only the experiential avoidance has a mediator role.
Conclusion: The findings of the study supported hoarding cognitive- behavioral models and suggested that experiential avoidance and hoarding cognitions play important roles in the growth and maintenance of the problems associated with hoarding.