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The method of a determination of a quantum wave impedance for an arbitrarypiecewise constant potential was developed. On the base of this method both thewell-known iterative formula \cite{Khondker_Khan_Anwar:1988} and alternativeways for a quantum wave impedance calculation were derived. A scattering and abound state case were considered. The general form of a wave function of boundstates for an arbitrary piesewise constant potential was obtained as well astransmission and reflection coefficients in a scattering case. The applying ofmethod was demonstarted on the system of double well/barrier.

Quantum wave impedance calculation for an arbitrary piesewise constant potential