  The difference between the strange and antistrange quark distributions,
$\delta s(x)=s(x)-\sbar(x)$, and the combination of light quark sea and strange
quark sea, $\Delta (x)=\dbar(x)+\ubar(x)-s(x)-\sbar(x)$, are originated from
non-perturbative processes, and can be calculated using non-perturbative models
of the nucleon. We report calculations of $\delta s(x)$ and $\Delta(x)$ using
the meson cloud model. Combining our calculations of $\Delta(x)$ with
relatively well known light antiquark distributions obtained from global
analysis of available experimental data, we estimate the total strange sea
distributions of the nucleon.
