In this paper a totally new microwave-assisted extraction apparatus is designed to develop the new technique——microwave extraction.The cylinder-shaped extractor has a concentric inner partition

which forms an annular space for the fluid to receive microwave energy from the inside of the concentric partition. In order to know whether it is fit for the demand of continuous production

the LDA (Laser Doppler Anemometer) method is used to measure axial velocity and tangential velocity of the fluid in the apparatus. The axial velocity and tangential velocity of different layers in the annular space are obtained

as well as the axial velocity at different rotation degrees θ. The effect of flow rate is also discussed. 2-D and 3-D figures are drawn by software Matlab to illustrate the data measured by Dual PDA. Another software PHOENICS is used to simulate and analyze the flow field in the microwave extractor. Compared with the experimental data

the result of PHOENICS is reliable.Improvement of flow field is achieved by revising the apparatus design with a conical inner partition.