In this paper, the distribution features of air-conditioning temperature field are discussed with numerical simulation methods for semi-opening large space building. Important influential factors, such as ambient air parameters space characteristics of semi-opening large space building and the method and parameters of air distributing, are presented. The connection between the air-conditioning temperature field of semi-opening space building and ambient wind is simulated emphatically with the under-seats air distribution method on the condition of ambient mind passing through the room or of motionless wind