The differences between Belfort 6000 and Belfort 6400 visibility meters in the calibration process were briefly introduced,and uses the WinForm interface design tool of C # language to build"one-click calibration intelligent platform of Belfort Visibility meter".The platform can be compatible with the calibration tasks of the two visibility metersa above,and realizes the instrument calibration in a one-click operation mode,reducing the instrument failure caused by human operation errors,and improving the work efficiency of station business personnel for equipment calibration.