A plug-in type power module includes a power unit and a heat-transfer unit vertically disposed on the power unit and extending outwardly away from two sides of the power unit. A first ceramic layer is disposed between the power unit and the heat-transfer unit. Therefore, heat generated by the power unit can be transferred from the first ceramic layer to the heat-transfer unit to increase the speed of heat dissipation. A subsystem having the plug-in type power module is also provided.