In this study, a non-corrosive carbon fiber reinforced polymer(CFRP) grid is arranged in thick concrete cover to solve the problem of wide crack opening and poor durability of reinforced concrete components under service conditions in hydraulic structures. We conduct experimental tests on totally 12 simply supported thick-cover reinforced concrete beams under four-point monotonic loading-9 with CFRP grid and 3 without, and analyze influencing factors of crack spacing and width, such as concrete cover thickn...