  We studied the properties of the MSSM Higgs bosons, h and H through the decay
into b-quarks in associated production with a top-quark pair. There was used
the tree-level Higgs sector described by two parameters M$_A$ and tan$\beta$
and found their optimal values according to experimental data of ATLAS
detector. Using the restricted parameter space we calculated cross sections of
associated $t\bar{t}h(H)$ production at 13 and 14 TeV, the corresponding
kinematical cuts, mass distributions and Branching Ratios of h and H decays
into $b\bar{b}$ quark pair.
