Tau leptons offer clean data source both for the
standard physics of low energy hadronic interactions and for searches of
new physics.
In the present talk we will review up to date properties of
TAUOLA monte carlo generator for the tau lepton decay and possible way it
can be combined with different production generators.
As examples for the applications we will use observable for measurement of
the heavy scalar parity at future LC, and measurement of the Z boson
couplings at LEP 1;
all with the help of the tau leptons of final state.
We will show also, how the low energy e+e- hadronic cross section can be
used  to parametrize tau lepton form factors of individual tau decay
channels. Question of combining experimental data with constraint from
phemomenological models into form-factors of particular tau decay modes
will be also adressed.