  A completely relativistic quark model in the Bethe-Salpter framework is
employed to calculate the exclusive production ratio of the neutral over
charged Kaon pair in $e^+e^-$ annihilation continuum region for center of mass
energies smaller than the $J/\Psi$ mass. The valence quark charge plays the key
r\^{o}le. The cancellation of the diagrams for the same charge case (in $K_S +
K_L$) and the non-cancellation of the diagrams for the different charge case
(in $K^-+K^+$) lead to the ratio as $(m_s-m_d)^2/M_{Kaon}^2 \sim 1/10$.
