Steel and poly-propylene fiber is used to improve on mechanical properties of cementious concrete in pavement. Geopolymer concrete is known as environmental material to replace concrete in construction site. In this research, the influence of steel and polypropylene fiber on compressive and flexural strength of geopolymer concrete is considered. The volume of fiber on range of 0,01 - 0,5 percent is used. Hence, the result is indicated that compressive strength of geopolymer concrete increased 6,6 and 8,7 percent and flexural strength of geopolymer concrete increased 15,8 and 21,2 percent when using poly-propylene fiber or steel fiber, respectively, with content of 0,5 percent in volume.