  Investigation of quasibound states of black holes is significant for expected
ultra light particles, as well as black holes through gravitational waves. We
first investigate quasibound states of a massive scalar field for dilatonic
charged black holes via numerical analysis. We study the complex eigen
frequencies of the massive scalar field in a wide range of gravitational fine
structure constant $\mu M$ in detail, and show the effects of charge. Further,
we study the eigen frequencies of the massive field through analytical approach
by matching the near horizon solution and far field solution, and find its
spectra for excited states by iteration method. We demonstrate the numerical
solution and analytical solution perfectly agree with each other in the region
where charge of the black hole is large, both for real and imaginary parts of
the eigen frequencies.
