  We have made next to leading order QCD fit to the deep inelastic spin
asymmetries on nucleons and we have determined polarised quark and gluon
densities. The functional form for such distributions was inspired by the
unpolarised ones given by MRST (Martin, Roberts, Stirling and Thorne) fit. In
addition to usually used data points (averaged over $Q^2$) we have also
considered the sample containing points with the same $x$ and different $Q^2$.
Our fits to both groups of data give very similar results. For the integrated
quantities we get rather small gluon polarisation. For the non averaged data
the best fit is obtained with vanishing gluon contribution at $ Q^{2}=1 {\rm
GeV^{2}}$. For comparison models with alternative assumptions about quark sea
and in particular strange sea behaviour are discussed.
