Electronic device and adaptor card thereof

An electronic device comprising:

• a housing, comprising an insertion slot;
• a connecting interface, disposed in the housing for connecting to a first electronic module or a second electronic module separately, the connecting interface comprising a first connecting part and a second connecting part;
• and
• an adaptor card, detachably disposed in the housing and comprising a flow guide;
• wherein, when the electronic device is in a first mode, the first electronic module is disposed in the housing through the insertion slot and connects to the first connecting part, and the adaptor card is disposed between the insertion slot and the second connecting part such that the flow guide directs an airflow toward the first electronic module;
• and
• when the electronic device is in a second mode, the adaptor card is removed from the housing through the insertion slot, and the second electronic module is disposed in the housing through the insertion slot and connects to the first connecting part and the second connecting part,
• wherein the adaptor card further comprises a dummy connecting part, and when the electronic device is in the first mode, the dummy connecting part connects to the second connecting part.