In this study, the effects of polymer based polypropylene fibers with four aspect ratios type on mortar properties have been investigated. Firstly, control samples were produced without fibers. The fibers were added to mortar mixtures in ratio of 0.6% 0.8% 0.9% and 1.1% by volume. On the mortars, compressive strength, flexural strength, ultrasonic velocity, water absorption and dynamic modulus of elasticity were defined and compared with control samples. According to experimental results, it was seen that when the compressive strength and dynamic modulus of elasticity was decreased by addition of fibers to mortar, bending strength and water absorption was slightly increased.