Abstract: Influences of moisture content and loading rate on flexural toughness were experimentally studied for fiber reinforced shotcrete (FRSC) with steel fiber or macro synthetic polypropylene fiber. According to the four- point bending test method specified in ASTM C1609 and Chinese standard CECS 13, the flexural toughness of specimens after drying for 0 h, 16 h, 24 h and 72 h under conditions of (20 ±2)℃ and (60 ±5)% relative humidity was tested at a loading rate of 0. 05 mm/ min. For the specimens dried for 24 h or 72 h, the flexural toughness was tested at loading rates of 0. 05 mm/ min, 0. 10 mm/ min, and 0. 20 mm/ min respectively. With the moisture content decreasing, the first-peak flexural strength decreased visibly. Brittle fracture happened to all the saturated FRSC specimens without drying during the bending tests. However, for the non-saturated specimens after drying for different periods, the residual flexural strength at prescribed deflections and flexural toughness T100,2. 0 exhibited decreasing tendency with the decrease in the moisture content of the specimens. The first-peak flexural strength, residual flexural strength at prescribed deflections and the flexural toughness T100,2. 0 of FRSC increased with the increase of loading rate. Given the same mix proportions, FRSC with higher relative water content presented more obvious increase of the mentioned flexural properties with loading rate increasing. This may be explained by the cohesive force caused by the Stefan effect.