Аннотация:Broad-band photometric observations of massive X-ray bunary black hole candidate Cyg X-1 were carried out during 1995-1998 in frames of the campaign of coordinated observations at different observatories of former Soviet Union. All data have been reduced to a homogenious set. Comparison of the optical and X-ray data clearly shows the existance of several kinds of variability. The cross-correlation analysis of the whole dataset permitted us to find correlations between optical and X-ray data on different time scales.