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The spontaneous breaking of chiral symmetry (SBCS) is one of the mostimportant phenomena of hadron physics. It defines the properties of all thelight mesons and baryons. The Chiral Perturbation Theory (ChPT) encodes QCDhadronic correlators at low-energy region in the terms the low-energy constants(LEC) -- the expansion parameters on light quark current masses $m$ andexternal momenta $p$. The LEC's can be extracted from the phenomenology or fromQCD lattice calculations. On the other hand, QCD instanton vacuum/instantonliquid model provides a very natural nonperturbative explanation of the SBCS.It provides a consistent framework for description of the pions and thus may beused for evaluation of the LEC. Our aim is to calculate the vacuum propertiesand the LEC's within instanton vacuum model and confront with phenomenology andlattice results.

QCD in Infrared Region and Spontaneous Breaking of the Chiral Symmetry