The South Galactic pole field SA141 is investigated by using the full calibration tools of RGU photometry. The observed RGU data are reduced to the standard system, and the separation of dwarfs and evolved stars is carried out by an empirical method. Stars are categorized into different metallicity classes and their absolute magnitutes are determined by the corresponding colour-magnitude diagrams. 9 extra-galactic objects have been eliminated from the present stellar statistical treatment. The local luminosity function agrees with the Gliese (1969) and the partly with the Hipparcos (Jahreiss & Wielen 1997) luminosity function. At the brighter luminosity intervals, the low value of the present observed luminosity function is most probably due to the larger uncertainty in the absolute magnitude determination implied by stars near the main-sequence turnoff. For giants, we found an upper limit, D*(0) = 6.80, of logarithmic local space density close to the one of Gliese & Jahreiss (1992), i.e.: (.) = 6.92.