  When a Simple Harmonic Oscillator (SHO) wave function is used as an effective
wave function, a very important parameter in the SHO wave function is the
effective $\beta$ value. We obtain the analytical expression of $\beta_{eff}$
($\beta_{effective}$) of the SHO wave function in coordinate space and momentum
space. The expression is applied to the light meson system
$(u\bar{u},~u\bar{s})$ to compare the behavior of $\beta_{eff}$. The results
show that $\beta_ {eff,\mathbf{r}}$ in coordinate space and $\beta_
{eff,\mathbf{p}}$ in momentum space are significantly different in the ground
state, however, similar in the highly excited states with Cornell potential.
