To study the contamination distribution in a chamber with perforated ceiling air supply,simulative analysis and experimental tests are carried out in this paper.In modeling,the Basic model and N-spot air model are both used for defining the orifice entrance boundary condition.The simulation results show that the distribution of contamination concentration agrees well with the test result.Especially,the simulation result of the N-spot air model is closer to the experimental one,which proves the feasibility of this model in analyzing indoor contamination distribution.