The concept of employing fibers to improve the behavior of civil engineering materials is an old idea. The modern technique of reinforcement using fibers started in the early 1960s. It is important to note that relatively few published information concerning fiber modified asphalt is available. In most these studies the effect of fiber modification has been secondary to the main purpose of the studies. The mechanism of reinforcement and investigation of effective fiber parameters have largely been ignored and the literatures only reflect the result of fiber applications. The purpose of this paper is to investigate on the comparison basis. The different textile modifiers in Hot Mix Asphalt (HMA) and the analysis of their effects on Marshal Test results (stability and flow) and Specific Gravity. The textile materials that were used in this study include: recycled waste tire cords, a type of Geo-Grid and four types of fibers: nylon 6.6, polyester, polypropylene and glass. The experiments showed that glass and polypropylene fibers could improve the stability rather than other fibers, the flow showed fewer sensitive to the addition of fibers and specific gravity was correlated well to the stability. For the comment of the outcomes, two theories were applied: fiber slippage and equivalent cross-section. At the end an Artificial Neural Network (ANN) established on the records and the system could predict the effective fiber parameters on the output specifications of HMA as the theories.