the fermion probabilty density equation dρ/dE =aρ(1-2ρ) which corresponds to the Dirac equation is derived. Next
the Feigenbaum's chaos theory is extended supposing that the pe- riod bifurcations are equivalent to the particle production. Then this extended theory can be used for desoribing the multiparticle production and the castade shower at high energies. Let λ= a m0 =4-A/In(E/E0)