  The fission processes of $^{112}$Sn + $^{112}$Sn and $^{116}$Sn + $^{116}$Sn
are simulated with the combination of the Langevin equation and the statistical
decay model. The masses of two fission fragments are given by assuming the
process of symmetric fission or asymmetric fission by the Monte Carlo sampling
with the
  Gaussian probability distribution. From the analysis to the isotopic/isotonic
ratios of the fission fragments from both reactions, the isoscaling behavior
has been observed and investigated in details. Isoscaling parameters $\alpha$
and $\beta$ are extracted as a function of the charge number and neutron
number, respectively, in different width of the sampling Gaussian probability
distribution. It seems that $\alpha$ is sensitive to the width of fission
probability distribution of the mass asymmetrical parameter but $\beta$ is not.
Both $\alpha$ and $\beta$ drop with the increasing of beam energy and the
reduced friction parameter.
