  Anisotropy is very important to understand cosmic ray (CR) source and
interstellar environment. The theoretical explanation of cosmic rays anisotropy
from experiments remains challenging and even puzzling for a long time. In this
paper, by following the ideas of Jokipii 2007, we use a simple analytical model
to study the CR dipole anisotropy amplitude, considering that CRs diffuse only
in perpendicular direction, with the ratio between the secondary and primary
cosmic rays omnidirectional particle distribution function as an input. We make
power law fitting of the observed B/C ratio and use it as the input of the
anisotropy model. We show that the modeling results can roughly describe the
general trend of the observational data in energy range from $6\times 10^1$ to
$3\times 10^{11}$ GeV. It is suggested that the perpendicular diffusion may
play a significant role in CR anisotropy in the wide energy range.
