The results represented in this thesis are based on our work in [1], where the predictions on the mass spectrum and Higgs boson decays are investigated in the supersymmetric standard model extended by U(1)B-L symmetry (BLSSM). The model requires two singlet Higgs fields, which are responsible for the radiative breaking of U(1)B-L symmetry. Radiative breaking of U(1)B-L symmetry yields right-handed neutrino of mass at the TeV scale. It predicts degenerate right-handed neutrino masses (1:7 2.2TeV) as well as the right-handed sneutrinos of mass . 4 TeV. The presence of right-handed neutrinos and sneutrinos trigger the baryon and lepton number violation processes, until they decouple from the Standard model particles. Besides, the model predicts rather heavy colored particles; m~t;m~b & 1:5 TeV, whilem~ & 100 GeV andm~ 1 & 600 GeV. Even though the implications on the SM-like Higgs boson are similar to minimal supersymmetric standard model (MSSM), BLSSM can predict another Higgs boson lighter than 150 GeV. We find that the second Higgs boson can be degenerate with the lightest CP-even Higgs boson of mass about 125 GeV and contribute to the Higgs decay into two photons. In addition, if it is not degenerate, it can provide a possible explanation for the excess in h ! 4l at the mass scale 145 GeV.