The traditional optical visibility instruments bear their respectine in observation defects.Digital photography visiometer system (DPVS) is one new type of visibility automation observation instrument

has been developed by adophing advanced digital photography technologe and imitating manual VisibiLity observation by human ege based on the definition of visibiLity visibility's theory and according to the definition of meteorological visibility.This thesis introduced the work theory of system、compose of system、structure of hardware and software flow

in the end some contrasted experiment results between DPVS and traditional optical visibility as well as manual visibility observation were given.The results show that the three ways share the same change trend with kind of differences.And in complicated weather conditions

like rainful the differences are more obvious.