  We ascribe the interpretation of the twin kilohertz Quasi Periodic
Oscillations (kHz QPOs) of X-ray spectra of Low Mass X-Ray Binaries (LMXBs) to
MHD Alfven wave oscillations in the different mass density regions of the
accreted matter at the preferred radius, and the upper kHz QPO frequency
coincides with the Keplerian frequency. The proposed model concludes that the
kHz QPO frequencies depend inversely on the preferred radius, and that
theoretical relation between the upper frequency ($\nt$) and the lower
frequency ($\no$) is $\no \sim \nt^{2}$, which is similar to the measured
empirical relation. The separation between the twin frequencies decreases
(increases) with increasing kHz QPO frequency if the lower kHz QPO frequency is
more (less) than $\sim$ 400 Hz.
