The working principle of active chilled beams (ACBs) was analyzed on the basis of unlimited space jet theory and cooler heat exchanger theory. Inducement ventilation model and cooler heat exchanger model were built under the assumptions. The two models were combined to establish ACBs model. Primary air volume, secondary air volume, water side heat transfer amount etc were measured in five specified static pressure value. Induction ratio and refrigerating capacity were selected as two standards of ACBs performance parameters. The results of the consistency and differences of theoretical value with practical value verified the established model.