Steel coupon(Q235)was phosphated quickly at room temperature by the barium modified zinc-system phosphating solution which is composed of H3PO4,ZnCl2,(NH4)6 Mo7O24·4H2O and so on reacted with each other. It was dried for 3h to produce dense phosphating film. The morphology and element contents of the films were analyzed. The film quality and corrosion resistance of phosphating film were determined. The results show that the morphology and corrosion resistance of phosphating film is improved by adding Ba2+ (0.6g/L)in zinc phosphate solution. The phosphating film is continuous and dense, whose crystalline size is less than or equal to 1~2μm. Its adhesive force reaches 1st grade after spraying epoxy resin antirust of iron oxide red.