Abstract: Under background of carbon peaking and carbon neutrality economic savings, it is urgent to develop high performance repair protect mortar for infrastructure repairing and protecting in complex service environment. In this paper, the effects of steel fiber (SF) dosing, ethylene-vinyl acetate copolymer (EVA) emulsion powder dosing, and the proportion of high-belite sulfate cement and ordinary Portland cement on the workability, mechanical properties, interfacial bonding performance and waterproofing/impermeability durability of the fiber reinforced polymer repair protect mortar (SCPRM) were investigated by Taguchi orthogonal method. Results reveal that the flowability, setting time, flexural strength (f_t), compressive strength (f_c), bond strength at 14 days (f_b^{14 d}), drying shrinkage at 90 days, water absorption after 3 days soaking, surface contact angle and chlorine ion permeability coefficient are 226.0 mm, 41 min/63 min (initial/final setting time), 5.2/17.1 MPa (f_t^{1 d}/f_t^{28 d}), 16.7/73.2 MPa (f_c^{1 d}/f_c^{28 d}), 3.61 MPa (f_b^{14 d}), 16.44×10⁻⁵, 0.16%, 70.04°, and 0.9486×10⁻¹² m²·s⁻¹, respectively. The corresponding macroscopic/microscopic structures show that SFs are uniformly dispersed in the hydration products and the EVA polymer film was netlike distributed. FTIR reveals the hydration feature of compound cementitious system, and the corresponding influence mechanism of its hydration of EVA dosing. Finally, a high-performance repair protect mortar with excellent comprehensive performance and adaptability to complex service environment are successively prepared.