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 (
\, \beta_\rm effective
). We obtain the analytical expression of
\, \beta_\rm eff
(
\, \beta_\rm effective
) of the SHO wave function in coordinate space and momentum space. The expression is applied to the light meson system
(u\baru, ~u\bars)
to compare the behavior of
\, \beta_\rm eff
. The results show that
\, \beta_ \rm eff, \, \boldsymbolr
in coordinate space and
\, \beta_ \rm eff, \, \boldsymbolp
in momentum space are significantly different in the ground state, however, similar in the highly excited states with Cornell potential.