In order to study the influence of household heat pump air conditioner air supply modes on thermal comfort, the environmental parameters, as well as 15 subjects' thermal sensation and thermal comfort, were investi? gated under the air supply modes of medium air supply, down air supply and distributed air supply in the artificial en? vironment laboratory. The results show that when the initial background temperature is 0 ℃ ，the air temperature around all human body parts can be increased quickly and evenly by the distributed air supply mode, and the overall thermal sensation and the overall thermal comfort of the subjects rise fastest, so the thermal comfort of the subject has a significant improvement. After the indoor thermal environment is stable, the temperature evenness of the distributed air supply is the minimum of 1.9 ℃, which makes the subjects in the air supply area feel warm, the local thermal sen? sation difference is the smallest, and the subjects in the other places do not feel cold. The fitting results of steady state local thermal sensation and overall thermal comfort show that the thermal sensation of the feet has a significant effect on the overall thermal comfort, the vertical air temperature difference of the distributed air supply and down air supply is less than 3 ℃，and the thermal sensation of feet can be improved in the air supply area. Thus, about 75% of the subjects are satisfied with the thermal environment. In conclusion, the distributed air supply can meet more people's requirements for thermal comfort.