To accommodate higher room temperature, stratum ventilation, a technically feasible air distribution which is fit for a small or medium size room, has been proposed. Under stratum ventilation, the fresh air is directly sent to the occupants' breathing zone. It could provide a satisfactory thermal comfort and better inhaled air quality in the breathing zone at higher room and supply air temperatures. However, the influence of occupants' movements was not considered in previous studies. In reality, sedentary and walking occupants are mixed in many conditioned rooms, such as in an open plan office and a waiting room. The influence of movements on the room air distribution has been reported. In this thesis, both experimental and numerical studies are carried out to find the influence of occupant movement under stratum ventilation and to compare with results obtained under other two air distribution methods, displacement ventilation and mixing ventilation. Visualized flow patterns are found under three air distribution methods (stratum ventilation, displacement ventilation and mixing ventilation) with a real walking occupant in the room to have a general view of the influence. Different walking speeds, walking routes, and walking repetitions are selected. It shows that the walking has a mixing effect in the room air, and the faster the walking speed is, the more serious the effect is. The measurement experiments are conducted in full-scale chambers with a real walking occupant or a moving manikin under three air distribution methods (stratum ventilation, displacement ventilation and mixing ventilation). Different moving speeds, moving routes and moving repetitions are tested. Velocity, temperature and CO2 concentration are measured to determine the influence on air distribution. The results show that the influence of a short-time movement on temperature profile and CO2 distribution are not significantly observed in the experiment. When the movement lasts for a long time, the movements produce a mixing effect and reduce the ventilation efficiency. The influence under mixing ventilation is the smallest however the ventilation efficiency of it is the lowest. The influence under stratum ventilation is smaller than that under displacement ventilation. Stratum ventilation has higher ventilation efficiency of heat removal at the occupant's head level than that of the other two air distribution methods. And the transport of contaminant under stratum ventilation is less than that under displacement ventilation. The numerical simulation is carried out for stratum ventilation with ANSYS FLUENT using the dynamic meshing. The configuration of the numerical model is the same as that of the physical model adopted in the experiments. The moving manikin moves for 2 turns along two routes at two moving speeds respectively. The results show that if the supply air is not blocked, the influence is smaller. The disturbance of the supply air is one of the factors of the contaminant transport. The influence of movements on temperature is significant but temporary which does not impact the thermal comfort. All the results demonstrate the application potential of stratum ventilation under a condition with frequent movements. Through further studies to optimize the design and the layout of the supply air terminals, stratum ventilation may perform better with moving occupants in conditioned rooms.