  The recent results in QCD at low energies are reported. The theoretical
analysis of hadronic tau-decay is performed in complex q^2-plane. The terms of
perturbation theory (PT) up to alpha^3_s are accounted, the terms of operator
product expansion (OPE) -- up do dimension 8. The momenta of charmed quark
vector current polarization operator are analyzed in 3 loops with account of
dimension 4 and 6 OPE terms. The main conclusion is that in the range of
low-energy phenomena under consideration PT and OPE are in good agreement with
experiment starting from Q^2=-q^2 ~ 1 GeV^2. The values of alpha_s(m^2_tau),
alpha_s<qq>^2, <(alpha_s/pi)G^2> and m_c(m_c)were found.
