Abstract: A combination electric plug assembly includes an electric plug, which has an electrically insulative housing defining a front receiving chamber and a set of power terminals and a set of signal terminals mounted in the front receiving chamber, and an adapter which has an electrically insulative housing defining a receiving chamber for receiving the electrically insulative housing of the electric plug, an electrically insulative core member suspending in the electrically insulative housing and insertable into the front receiving chamber of the electric plug, and a set of terminal power terminals and a set of signal terminals respectively mounted in the electrically insulative core member and respectively soldered to a circuit board of an electronic apparatus for the contact of the power terminals and signal terminals of the electric plug for transmitting power supply and signal at the same time.