  We study dynamical aspects of circumstellar environment around massive
zero-metallicity first stars. For this purpose we apply our NLTE wind models.
We show that the hydrogen-helium stellar wind from stationary massive first
generation (Population III) stars (driven either by the line (bound-bound) or
continuum (bound-free and free-free) transitions) is unlikely. The possibility
of expulsion of chemically homogeneous wind and the role of minor isotopes are
also discussed. Finally, we estimate the importance of hydrogen and helium
lines for shutting off the initial accretion onto first stars and its influence
on initial mass function of first stars.
