  String theory is a promising candidate for a fundamental quantum theory of
all interactions including Einstein gravity. Some solutions in string theory
can be interpreted as black holes. Using the semi-analytic method and WKB
method,the quasinormal modes(QNMs)of 1+1 dimensional black hole in string
theory are studied.The QNMs of 1+3 dimensional black hole in string theory are
also calculated through numerical approach.The numerical investigation has
shown that the late time gravitational oscillation of the black hole under an
external perturbaton is dominated by certain QNMs.
