An important problem in the liAbstract:An important problem in liner optimization of ducted fan is to verify whether a designed liner construct possess the desired acoustical properties at presence of flow by experiment.The paper reviews the development of flow ducts facility

introduces the flow ducts facility built up in BUAA

and its configuration

operating principle and an initial test.It shows the flow is uniform in the test section

the sound field without inflow obey the rule of guided duct theory

all of that illustrate the facility satisfy the request for the device fundamentally.The test is only initial

further work for the impedance measurement of the terminals either with flow or without flow and other experimental research works about flow duct facility will be continued.