Shot peening is a surface treatment method in which specimens getting shot with the steel balls repeteadly, so it caused plastic deformation on the surface occure because collisions. In this research, Stainless steel 316L (SS-316L) was chosen as a dynamic compression plate (DCP) because it has better and stronger corrosion resistance and higher temperatures.. The aim of the research is to know the effect of steel ball shot peening diameter after drilling of macro and micro structures, surface roughness, geometry, wettability, and microhardness on SS-316L DCP surface. Treatment of shot peening used DCP-316L with dimensions of 105 mm × 14 mm × 4 mm with 6 parallel holes in the form of a circle with a diameter of 5 mm. The variabels used are steel ball variation those are 0,4 mm, 0,6 mm, and 0,7 mm with duration of treatment time is 10 minutes. The distance between nozzle and specimen are 100 mm, and constant pressure 6 bar. The results showed that the shot peening process change the macro structure, thus forming the basin on the surface. It can also alter the microstructure of surfaces and sub-surface. Surface roughness increases from 0.83 μm to 2.20 μm. Geometric measurements including thickness, plate hole diameter, and ellipse diameter decrease in size. The wettability of the angle of contact angle decreases from 77.64 º to 69.52 °. Average microhardness distribution increases from 274.3 HVN to 350.9 HVN.