Shrinkage in concrete is a process that occurs due to changes in the amount of moisture inside the concrete. In most building materials, there are holes in the spaces between the molecular structure that, in the vicinity of moisture, increase in volume, and when they dry they tend to collapse, and this is the main cause of cracking in them. In this paper, the effects of modified polypropylene fibers on the amount of shrinkage due to drying of concrete in the form of a laboratory study have been investigated. two types of modified polypropylene fibers with values of 1.5 and 2.5 kg / m 3 in concrete mixture were investigated. Compressive strength for 7-day and 28-day periods and drying shrinkage for different time periods have been investigated. It was observed that the addition of modified polypropylene fibers to concrete did not change the compressive strength compared to the control concrete specimens, and its amount remained within the range of compressive strength of the control concrete. The study on shrinkage due to drying and changes in the length of the specimens showed that the addition of fibers to concrete reduced the amount of shrinkage compared to the reference concrete.