Three RC beams strengthened with carbon fiber reinforced polymer (CFRP) plate and one contrast beam were tested to investigate the flexural property. The effect of prestress and the anchorage on the performance was analyzed in terms of bending capacity, stiffness, development of crack, utilization rate of carbon fiber reinforced polymer plate. The test results showed that the prestressed CFRP plate can significantly improve flexural capacity of the specimens, utilization rate of CFRP plate, and deformation properties, decrease crack width, and the structural ductility was reduced which we should consider when designing reinforcing components. Two types of anchorage could meet the requirement of operational phase, Considering all aspects, the MJ-2 anchorage without slot was more applicable.