A clean surfaces phosphating solution of hot galvanizing without washing was designed to H3PO4,ZnO,Mn(H2PO4)2·2H2O,(NH4)6Mo7O24 ·4H2O,Ca(NO3)2 ·4H2O by orthogonal test method. The effects of different pH value, phosphate temperature, the self dry time, and phosphate time on the phosphating coating properties were analyzed. The results showed that when the pH value from arange of 2.6~3.3, the phosphating temperature from arange of 5~40℃, the wash-free phosphate coating was obtained after being immerged in the phosphating solution for 7 to 10 minutes and drying for 3 h. The time of resist corrosion for phosphate coating was more than 50 s. Its cling force reached 1st grade after spraying epoxy resin antirust of iron oxide red.