A kinetic model of peritectical transformation, which takes place under conditions of biphase contact (primary - peritectical and peritectical - liquid phases) is developed. In this case, the peritectical phase, by expanding along the surface of primary crystals, forms a continuous environment and blocks them from a liquid. The kinetic function <$E epsilon~=~f(t)>, where <$E epsilon> is the output of the peritectical reaction and <$E t> is time, is expressed by a parabolic dependence. The adequacy of the mathematical description is confirmed by experimental data on the kinetics of peritectical structure-forming in melts of the Fe - Sb system.

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