By analyzing the surface stress changes of rear cover glass for double photovoltaic modules, the stress distribution of rear cover glass surface is larger and more uneven than the front glass because of printing and drilling process. The main parameters effecting the rear cover glass surface stress such as cooling air pressure, heating time and heating temperature were analyzed. Expansion coefficient difference between solar glass and printing ink depends on the type of printing ink, which can affect the surface stress, impact test and four points bending, thus determine that the mechanical properties of rear cover glass is weaker than the front glass.