Concrete is a commonly used construction material for construction work. Concrete has the disadvantage of being brittle so it is not strong enough to withstand tensile. To overcome the weakness in concrete can be done by adding fiber in the concrete mixture. The fiber that will be used in the concrete mixture is Micro Fibers fabrication. This study aims to determine the effect of using Micro Fibers as an additive in concrete on the compressive strength of concrete, to determine the effect of concrete on the split tensile strength of concrete and to determine the optimum value of Micro Fibers in concrete mixtures. The method used for data collection in this study is the experimental method in the Laboratory of the Faculty of Engineering, Widyagama University Malang. The analysis method used to analyze and observe the data is statistical method using single factor Anova analysis, and for tensile strength calculated using Microsoft Excel. The results of this study indicate that the addition of Micro Fiber affects the compressive strength of concrete, where the results of anova analysis show F count 8.48099 > F table 2.866081. The addition of Micro Fiber also affects the split tensile strength, where the anova analysis results show F count 3.060887 > F table 2.866081. The optimum value of concrete compressive strength with the addition of 2.59% fabricated fiber produces a maximum compressive strength of 25.67 Mpa.