  We suggest a new solution to the strong CP problem. The solution is based on
the proper use of the boundary conditions for the QCD generating functional
integral. We expand the perturbative boundary conditions to both perturbative
and nonperturbative fields integrated in the QCD generating functional
integral. It allows to nullify the CP odd term in the QCD Lagrangian and thus
to solve the strong CP problem. The presently popular solution to the strong CP
problem with introducing axions violates the principle of renormalizability of
Quantum Field Theory, which is very successful phenomenologically. Our solution
obeys the principle of renormalizability of Quantum Field Theory and does not
involve new exotic particles like axions.
