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RI photometric observations of an extreme long period eclipsing binary star AZ Cas have been made at the Yonsei University Observatory using the 60- Goto reflector for three seasons from 1990 to 1993. A total of 884 observations are made for 77 nights. All the data are standardized and determined the magnitudes and color of AZ Cas. No significant light variation at the outside eclipse phase between 0.p 54 - 0.p 87. RI and color curves of AZ Cas are presented.