  The high quality light curves of Kepler space telescope make it possible to
analyze the optical variability of AGNs with an unprecedented time resolution.
Studying the asymmetry in variations could give independent constraints on the
physical models for AGN variability. In this paper, we use Kepler observations
of 19 sources to perform analyses on the variability asymmetry of AGNs. We
apply smoothing-correction to light curves to deduct the bias to high frequency
variability asymmetry, caused by long term variations which are poorly sampled
due to the limited length of light curves. A parameter $\beta$ based on
structure functions is introduced to quantitively describe the asymmetry and
its uncertainty is measured using extensive Monte-Carlo simulations. Individual
sources show no evidence of asymmetry at timescales of $1\sim20$ days and there
is not a general trend toward positive or negative asymmetry over the whole
sample. Stacking data of all 19 AGNs, we derive averaged $\bar{\beta}$ of
0.00$\pm$0.03 and -0.02$\pm$0.04 over timescales of 1$\sim$5 days and 5$\sim$20
days, respectively, statistically consistent with zero. Quasars and Seyfert
galaxies show similar asymmetry parameters. Our results indicate that short
term optical variations in AGNs are highly symmetric.
