During the observing seasons, OJ 287 was brightening. Its luminosity reached
a maximum in November 1995, afterwards, declined and in February 1995 dropped
down to nearly the 1994 April level. Variability with timescales of
minutes, hours and one day was observed. Our fast photometry shows that
there has been variability during the sampling interval in five nights out
of six, with rms amplitude of flux variations 
. The smallest
average sampling interval in these nights is 3.4 minutes, during which the
rms amplitude was about 
. The largest rms amplitude (
) occured
within an average sampling interval of 4.7 minutes on 1994 November 7. These
rapid variations could result from shocks within turbulent jet or from
vortices and magnetic flux tubes on accretion disk.
Acknowledgements
We wish to thank the anonymous referee for his careful reading of the original manuscript and useful suggestions that enabled us to improve the presentation of this work. We also wish to thank the staff of the Optical Union Opening Observatory in the Yunnan Base and of the computer department in the Yunnan Observatory for their help in observations and data processing. This work was partly supported by the astronomical committee of the Chinese Academy of Science and climb project in China.