AbstractPrestressing basalt‐fiber‐reinforced polymer (BFRP) bars and three types of fibers were used to enhance precast slabs during construction. Experimental investigation was conducted on one control slab and three reinforced slabs, while equations for the flexural behavior of slabs and optimization were performed. The results demonstrated that the addition of fibers had minimal impact on the compressive strength of concrete, but significantly improved its flexural strengths by up to 36%. Fibers and BFRP bars with a prestress level of 40% enhanced the cracking load by a range of 506% to 584%, and the ultimate load by a range of 28% to 48%, while exerting minimal influence on the yield load. Reinforced slabs exhibited a reduction in yield deflection ranging from 57% to 67%, along with a decrease in ultimate deflection ranging from 33% to 42%. Prestress played a crucial role in controlling slab cracks, whereas fiber type had only minor effects. The equation derived for predicting experimental results regarding normal section cracking moment showed a maximum deviation not exceeding 5%. Material utilization can be improved by reducing slab thickness or the number of prestressing bars, followed by lowering prestress levels and truss numbers. Prioritizing reduction in slab thickness is recommended from a construction perspective.