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Here we have obtained the {\it BVRI CCD} photometry down to a limitingmagnitude of $V \sim$ 20 for the southern poorly studied open cluster NGC 6631.It is observed from the {\it 1.88 m} Telescope of Kottamia Observatory inEgypt. About 3300 stars have been observed in an area of $\sim 10^{\prime}\times 10^{\prime}$ around the cluster center. The main photometric parametershave been estimated and compared with the results that determined for thecluster using {\it JHKs 2MASS} photometric database. The cluster's diameter isestimated to be 10 arcmin; the reddening E(B-V)= 0.68 $\pm$ 0.10 mag, E(J-H)=0.21 $\pm$ 0.10 mag, the true modulus (m-M)$_{o}$= 12.16 $\pm$ 0.10 mag, whichcorresponds to a distance of 2700 $\pm$125 pc and age of 500 $\pm$ 50 Myr.

CCD BVRI and 2MASS Photometry of the Poorly Studied Open Cluster NGC 6631