||We study the Higgs phenomenology with extra Electroweak symmetry breaking (EWSB) contributions, the Electroweak phase transition patterns are found to be highly related with the vacuum structure induced by which. Different phenomenology implications restrict the Higgs potential structures that utilizing for the Electroweak phase transition studies. To demonstrate the feature, we perform the Electroweak phase transition study and the Higgs phenomenology with the Georgi-Machacek (GM) model. Different from the case without the extra EWSB contributions (e.g. Standard Model with one real singlet scalar (xSM)), the possibility for a detection of the strong first order Electroweak phase transition (SFOEWPT) through the gravitational wave (GW) signal being generated during which is much lower. In comparison with the LHC at 13 TeV and 14 TeV, the projected lepton colliders is more powerful to search for the parameter spaces for the SFOEWPT. A much larger extra EWSB contribution can lead to a two-step SFOEWPT for the low mass of the fiveplet in the GM model, where the lepton collider, such as ILC, is able to search for the parameter spaces and complementary with the gravitational wave searches of the space-based interferometers.