Abstract: To identify the true location of the noise sources, the shear layer effect must be taking into account when conducting the microphone array test in open-jet wind tunnels. An experimental study for the shear layer correction was performed in the 0.55m×0.40m aero-acoustic tunnel of China Aerodynamics Research and Development Center(CARDC). The shear layer velocity profiles, source-receiver delay times and source identification results were obtained. The Gortler's velocity-profile solution was validated and four different shear layer correction methods were compared and analyzed on the basis of the experimental results. The research results show that:the velocity-profile experimental data agrees well with calculations when the self-similar parameters σ=9, ξ₀=0.2 are chosen, and the relationship between the fitted shear layer thickness and the axial distance data can be presented by the equation y=0.15x; Ma ≤ 0.3 and the measurement angle θ_m within 40°~140°, the relative calculation error of the delay time of different shear layer correction methods is smaller than 1%; the accuracy of the other three methods are quite close to the Amiet 2D method. A fast ray tracing method that is 100 times faster than the conventional ray tracing method is proposed, which makes the ray tracing method applicable for on-line microphone array data processing.