A DC/DC module power supply (12) includes a circuit board (121) and one or more orientation members (13). One terminal of each of the orientation members (13) is a plug-in unit, and another terminal is a surface-mounting pad. The plug-in units of the orientation members (13) are correspondingly connected with the through-holes of the circuit board (121), and the surface-mounting pads of the orientation members (13) are connected to a system board (11). This construction could improve the power density and the heat-dissipation capability of the DC/DC module power supply (12), and also improve the layout density of the system board (11) and enhance the soldering reliability of the DC/DC module power supply (12) onto the system board (11).
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