  We study the condition for the dilaton stabilization in Type IIB flux
compactifications consistent with the KKLT scenario. Since the
Gukov-Vafa-Witten superpotential depends linearly on the dilaton, the dilaton
mass squared is given by a sum of the gravitino mass squared and additional
terms determined by the complex structure moduli stabilization. If the dilaton
mass is not much enhanced from the gravitino mass, the mass mixing with the
K\"ahler modulus in the presence of the non-perturbative effect generates the
saddle point at the supersymmetric field values, hence the potential becomes
unstable. When the complex structure moduli other than the conifold modulus are
neglected, the saddle point problem arises over the controllable parameter
space. We also point out that the dilaton stabilization condition is equivalent
to the condition on the NS 3-form fluxes, $|H_{(1,2)}| > | H_{(0,3)}|$.
