Aiming at the low precision and lacking of test data of blade vortex interaction (BVI) noise, and in order to conduct an experimental research about the separation of rotor noise, a new multi-airfoil vortex generator is designed. Firstly, a model of vortex generator of different angles of attack of airfoil section by CATIA software is established. Secondly, flowfield of vortex generator is simulated by FLUENT software in order to analyze the influence of different angles of attack. By the particle image veloci-metry (PIV) technology, the flowfield of airfoil with different angles of attack and different distances to the vortex generator of different flow velocity are measured, then the experimental results are analyzed. Aiming at the weak vortex core and density,[JP+3]the traditional one-stage vortex generator is improved by increasing an airfoil section and it can produce steadier and stronger vortex than one-stage vortex generator proved by PIV test. The new vortex generator is successfully used in the BVI noise experiments.