Today, small and medium enterprises in Iran are having problems in exporting their products. Acquisition of sufficient information about the cause of this issue is crucial for a SMEs export decision.This study by a fuzzy model to investigate this issue deals.The first step is to identify the sub-factors and factors of the fuzzy Delphi method was used.In order to structuring and prioritizing the sub-factors and factors fuzzy DANP method was used.The results of this method, institutional and banking system introduced as the most important factor and sub-factor.In order to investigate the effect of these sub-factors on selected SMEs, linear assignment was used.The results show that the identified sub-factors have the greatest impact on the activities of SMEs that are engaged in exporting non-metallic minerals.