  Two different strategies of the relativistic quantum theory construction are
considered and evaluated. The first strategy is the conventional strategy,
based on application of the quantum mechanics technique to relativistic
systems. This approach cannot solve the problem of pair production. The
apparent success of QFT at solution of this problem is conditioned by the
inconsistency of QFT, when the commutation relations are incompatible with the
dynamic equations. (The inconsistent theory "can solve" practically any
problem, including the problem of pair production). The second strategy is
based on application of fundamental principles of classical dynamics and those
of statistical description to relativistic dynamic systems. It seems to be more
reliable, because this strategy does not use quantum principles, and the main
problem of QFT (join of nonrelativistic quantum principles with the principles
of relativity) appears to be eliminated.
