Pavement bleeding is one of the main problems and breakdowns in Iran and Khuzestan province road system and especially in roads which experience heavy transit loads. This phenomenon causes reduced safety in roads and potentially increases the risk of accidents especially in rainy seasons. In this paper, we first divided the Khuzestan province into three climatic regions and then investigated pavement bleeding contributing factors in each region. First we sampled bleeding and healthy surfaces from different roads. The healthy surfaces were sampled to provide assistant and comparison to the investigation. After gathering quality control information and using test results on bleeding and healthy samples, some possible explanations for pavement bleeding were determined. Factors involved in the pavement bleeding phenomenon such as using more tar percentage than specified optimum amount in the design, empty spaces in asphalt mixture, asphalt mixture pollution with substances such as gasoline and fuel oil, excessive use of surface and penetrating coatings, method for determining the optimum tar amount, and laboratory errors related to determining the amount of tar in different areas and environmental conditions (including traffic and climatic conditions), were investigated and the impact of each of these factors on the pavement bleeding phenomenon in studied roads were determined.