Using schlieren apparatus to research the subsonic attached wall jet flow in the fluidic element. Many times with high-speed drive m to 5000 m/SEC send continuous shooting speed of the switching process of fluidic element. On the schlieren technique, this paper presents a new can obtain higher sensitivity of every other line usage. Experiment results, the physical design of switch components. Confirmed the chi blunt switch and quickly switch there are fundamental differences, especially points out the fast switch, flow only one beam "stranded" phenomenon, and in fact is still in the position for exchanges between oscillation;Pointed out in this paper the research scope, conditions and at the same time switch "reaction time" there was a big difference between reasons that cause nervous. "reaction time" dispersion, only one literature reports, but also a variety of experiments confirmed for us.Our company's main equipment and technology has the schlieren apparatus, photonic doppler velocimeter, planar laser induced fluorescence PLIF, etc.If there is any need to please contact us: 0816-6204826