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Surface roughness before painting mainly by adjusting the control of abrasive particle size, shape, material and jet velocity, effect of process parameters such as time, among them with abrasive particle size influence on the roughness is bigger. The following table lists the steel structure painting association (SSPC) by various abrasive jet measured roughness. Set by the international organization for standardization of shotcrete ISO8503 standard stipulated in the steel surface properties after processing the microscopic measurement, stylus measuring method and the surface roughness of ISO benchmark sample piece of three kinds of evaluation method. In fact, still adopts the traditional with probe and calibration table Elcometer123 roughness measuring instrument, or use the RUGOTEST NO. 3 or COATTEST compare sample blocks for standard way to measure or assess the surface roughness. In before a shop primer for steel surface further, we must remove all dirt, and put on hold during the corrosion and aging, transportation, welding parts in the assembly process and heat treatment shop primer are produced when the injury and defect, must be made to derusting, namely secondary descaling.