Stereolithography (SL) is a process in which the 3D object is finished by the layer-by-layer curing, so the surface properties of the cured materials have notable effects on the bonding power between the layers. In order to investigate the properties and influence factors of the UV cured surface formed by the epoxy acrylate, probe components were used, and the surface properties of the cured films were characterized by means of contact angle measurement and ATR-FTIR analysis. The results showed that the probe components migrated during the curing process, which causes the inhomogeneity distribution of their contents from surface to inner of the layer, and in turn influences the surface energy of the cured layers. Notwithstanding their very low concentrations (0.01%) , the probe components caused a drastic change in the surface energy of the layers (Deuchem 467 made the surface energy decrease from 51.32 mJ m,-2, to 35.05 mJ m,-2, ). Besides, the diversity of the surface energy of the surface and interface was also observed. In conclusion, both chemical nature of the probe components and the curing process (curing atmosphere and substrates, etc) can affect the migration extent of the probe components.