  We calculate how accurately parameters of the short-period binaries $(10^{-4}
{Hz} \lsim f\lsim 10^{-2} {Hz})$ will be determined from the gravitational
waves by LISA. In our analysis the chirp signal ${\dot f}$ is newly included as
a fitting parameters and dependence on observational period or wave frequency
is studied in detail. Implications for gravitational wave astronomy are also
discussed quantitatively.
