A memory heater and heating air arrangement includes circuit module including circuit board, a plurality of memory modules mounted at the circuit board, memory heat sink wrapped around each memory module and locating member mounted at the circuit board around the memory modules, heating aid including flat heat-transfer base panel bonded to top side of the memory heat sinks, mounting structure located at the border of the flat heat-transfer panel and affixed to the locating member to secure the heating aid to the circuit module, and a heater attached to a top surface of the flat heat-transfer base panel of the heating aid and controllable by the circuit module to emit heat to the memory modules via the heating aid, enabling the memory modules to work under a cold environment. Subject to the functioning of the heating aid, one single heater is sufficient to heat the memories, saving the cost.