BL Lac objects and Flat Spectrum Radio Quasars (FSRQ) constitute Blazar class of Active Galactic Nuclei that their jet axis have an angle less than 10-deg with the observer's line of sight. BL Lac objects are characterized by having weak or no emission lines in their optical spectrum. They radiate in whole bands of electromagnetic spectrum as other AGNs do and show rapid and high amplitude variations in all bands as well. The reason for these variations may be originating from interaction of the central components and SMBH and/or variation in jet structure. In this study, we present the recent results of our observational studies using optical telescopes in our country.