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We use the Dirac equation to study the mass spectrum of mesons withheavy-light quark combinations. First we study the Dirac equation withspherically symmetry and funnel potential, and apply them on the hydrogen-likeatom problem to check the correctness of our numerical program. Then we testthe parameters in Olsson's paper. We show that Olsson's parameters are good infitting the averaged central mass, but fail to get correct energy finesplitting. Finally we fit the mass spectrum data of D, D_s, B and B_s mesonswith our parameters by solve the Dirac equation and funnel potential, calculatethe energy splitting of the S and P states. Our parameters can fit the mass andfine splitting with errors in less than 7 MeV.

Meson Mass Spectrum of Heavy-Light Quarks Combinations with Dirac Equation