Hadron properties and quantum chromodynamics

The review in which hadron properties are described within the framework of quantum chromodynamics is presented. It is supposed that quarks are bound into hadrons because of interaction with vacuum fields. Quark interaction with soft vacuum fields grows as a certain degree of the distance between quarks. Sum rules are obtained, corrections to which are calculated by means of operator expansion. The rho meson theory is discussed. Calculations of the rho meson mass and electron width are given