X-ray spectra of OJ 287 from X-ray observations in 2005 to 2016 were analyzed to determine the variability in X-ray. Spectral data were obtained from X-ray Imaging Spectrometers (XIS) from Suzaku mission and X-ray Telescope (XRT) mission from Swift. Energy intervals of the X-ray spectra are 0.4 -10 keV for Suzaku/XIS and 0.3 -7 keV for Swift/XRT. The data were divided into several non-outburst and outburst data groups. In general, power law model is considered the most appropriate model and it is also confirmed that the X-ray spectra of OJ 287 during that period exhibit fluctuation in photon index value, Γ. Variability of the value of Γ indicates that there is evolution of the X-ray spectra of OJ 287 during the non-outburst phase and also during the transitions between non-outburst and outburst phase and vice versa. Different values of Γ are also found during different outburst phases. In general, the derived values of Γ are in agreement with the inverse Compton process (Γ ~1 -2), in contrast with the synchrotron process (Γ ~2 -3). We also found that Γ increases as the flux increases, as opposed to synchrotron process. In addition, X-ray luminosity of OJ 287 shows fluctuation within . The X-ray light curve was made and compared with an optical light curve to investigate the correlation of outbursts time in both bands.

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