Some Beyond the Standard Model (BSM) Higgs particle may interact strongly with other particles at energy scales presently studied at the LHC, the study of Higgs production associated with heavy quark pairs may help us search for these BSMs. We compare two different schemes, the 4 flavour scheme and the 5 flavour scheme, to describe this process at LO + n jet by merging matrix element and parton shower approach on MadGraph 5 interface to PYTHIA. We show that the 4 flavour scheme may provide better description than the 5 flavour scheme at LO + n jet level.