We consider the EWPT in the economical 3-3-1 (E331) model. Our analysis shows that the EWPT in the model is a sequence of two first-order phase transitions, (SU(3) ightarrow SU(2)) at the TeV scale and (SU(2) ightarrow U(1)) at the 100 GeV scale. The EWPT (SU(3) ightarrow SU(2)) is triggered by the new bosons and the exotic quarks; its strength is about 1–13 if the mass ranges of these new particles are 10(^2)–10(^3)?GeV. The EWPT (SU(2) ightarrow U(1)) is strengthened by only the new bosons; its strength is about 1–1.15 if the mass parts of (H^0_1), (H^pm _2) and (Y^pm ) are in the ranges 10–10(^2)?GeV. The contributions of (H^0_1) and (H^{pm }_2) to the strengths of both EWPTs may make them sufficiently strong to provide large deviations from thermal equilibrium and B violation necessary for baryogenesis.
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