The BV-photographic photometry was made for 1714 stars (V<19.5) in NGC 6752. The C-M diagram of this cluster shows an unusually extended blue horizontal branch $(V=13.5{sim}17.8)$ with a wide gap $(V=16{sim}16.7)$ and the well defined giant branch with gaps at V=13.85 and 16.2. The turnoff point is defined at $V=17.25{pm}0.15$ and (B-V) = $0.46{pm}0.02$. If we take $V_{HB}=13.85$ for NGC 6752, then ${Delta}V=2.80,;(B-V)_{0,g}=0.76;and;{Delta}V_{TO}=3.40$ and the chemical abundance is estimated to be [Fe/H]=-1.67 or $Z=4.3{ imes}10^{-4};and;Y=0.26$. Some other physical parameters of this cluster are derived and compared with those for the well observed clusters M 3, M 13, M 15 and M 92.