A search for doubly charged Higgs bosons has been performed using Monte Carlo data samples corresponding to an integrated luminosity of 19 fb-1 with the 8 TeV of centre-of-mass energy at CMS, LHC in 2012. Doubly charged Higgs bosons are assumed to decay to mimi, ee and mie, under the assumption Br(H±± mimi)=100%, Br(H±± ee)=100% and Br(H±± mie)=100%. An analysis of doubly charged Higgs bosons at the CMS detector is presented. No signal is observed and limits at the 95% confidence level are set on the H±± mass. Upper bounds of 529 GeV/c2 in the mimimimi channel, of 530 GeV/c2 in the eeee channel, of 520 GeV/c2 in the miemie channel are set.