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A total of 792 CCD images of V523 Cas were obtained on four nights of Jan. 2003 with the BVRI CCD photometric system attached to a 61cm reflector of Sobaeksan Optical Astronomy Observatory (SOAO). The 17 standard stars in the images were used to establish transformation relations between our BVRI system and the standard Johnson-Cousins BVRI system. We derived the tentative equations of transformation between two photometric systems as follows; V = v-0.0689(B-V)+0.0063 B-V = 1.3197(b-v)-0.1733 V-R = 0.9210(v-r)-0.1309 R-I = 0.8892(r-i)-0.1055. Using these equations standard V magnitudes and their color indexes (B-V, V-R, R-I) for 57 stars in the field of the image were determined.