  We shown the general approach for Q2 evolution of parton densities and
fragmentation functions at low x based on the diagonalization. The
diagonalization leads to the two components in the Q2 evolution, each of which
contains a nonperturbative parameter. The values of the parameters can be found
by fits of the experimental data for the deep-inelastic scattering structure
function F2 and for average jet multiplicities. One of the components contains
the all large logarithms ln(1/x) and produce the basic contribution at small x
region. The second one is regular at low x but its contribution is very
important to have a good agreement with experimental data
